Correct reading for the triple beam balance is 191.4 grams.

To solve this problem, we need to read the values from the triple beam balance shown in the image. A triple beam balance has three beams, each with a sliding weight (rider) that measures mass in different increments.

Let’s analyze each beam:

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Beam 1 (Top beam):

- This is the 100-gram beam.
- The rider is positioned at 90 grams.
- So, 90 grams.

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Beam 2 (Middle beam):

- This is the 10-gram beam.
- The rider is positioned at 100 grams, but wait — actually, this beam goes from 0 to 500 grams in 100-gram increments.
- Looking closely: the rider is aligned with the 100 mark on the scale.
- So, 100 grams.

Wait! That can't be right — because the top beam already has 90g, and if middle is 100g, total would be over 190g, which is possible, but let's double-check.

Actually, no — the middle beam is for 100-gram increments? Wait — let’s clarify:

In a standard triple beam balance:
- The longest beam (bottom) is for grams (usually up to 10g).
- The middle beam is for 100-gram increments (0–1000g).
- The top beam is for 10-gram increments.

But looking at the image:

- Top beam: 0 to 100g → this is the hundreds beam (100g per division)
- Middle beam: 0 to 500g → this is the tens beam? No — actually, it's labeled in 100g increments: 0, 100, 200, etc., so this is the hundreds beam?

Wait — confusion arises. Let’s look carefully.

Standard triple beam balance setup:
- Rear beam (top): 0–100g → 100g increments
- Middle beam: 0–100g → 10g increments (each small mark = 10g)
- Front beam: 0–10g → 1g increments

But in this image:

- Top beam: 0 to 100g → rider at 90g → so 90 grams
- Middle beam: 0 to 500g → but it's marked in 100g intervals (0, 100, 200, 300, 400, 500) → so this is likely the hundreds beam?
- But the rider is placed just past the 100 mark? Wait — the rider is aligned with 100 on this scale.

Wait — no: the rider is on the 100 mark of the middle beam.

But if the middle beam goes from 0 to 500g, and the rider is at 100, then that’s 100 grams.

Then the bottom beam (front beam) is for 0 to 10g, and the rider is at 1.4g? Let's see.

Looking at the bottom beam:
- It's labeled 0 to 10g.
- The rider is between 1 and 2, but closer to 1.
- Actually, it looks like it's at 1.4 grams? Let’s check.

No — wait: the rider is just after the 1 mark, and there are 10 small divisions between 0 and 1? No — actually, the scale is divided into tenths.

Wait — the bottom beam has marks at 0, 1, 2, ..., 10, and each large division is 1 gram. Between each gram, there are 10 smaller ticks — so each tick is 0.1 gram.

Now, the rider is at the 4th small tick after 1, so that’s 1.4 grams.

But wait — no: look again.

The rider is aligned with the 1.4 mark? Actually, it's at the 1.4 position.

So:
- Bottom beam: 1.4 grams

But now we have:
- Top beam: 90 g
- Middle beam: 100 g
- Bottom beam: 1.4 g

Total = 90 + 100 + 1.4 = 191.4 grams

Wait — but the middle beam shows 100g? Is that correct?

Wait — no! Let’s re-express the beams correctly.

Actually, standard triple beam balance:

- Rear beam (top): 0–100g → 100g increments
- Middle beam: 0–100g → 10g increments (so it's for tens of grams)
- Front beam: 0–10g → 1g increments (with 0.1g subdivisions)

But in this image:

- The top beam is labeled 0 to 100g → so this is the hundreds beam → rider at 90g → 90 grams
- The middle beam is labeled 0 to 500g → but this seems wrong.

Wait — actually, the middle beam is labeled 0 to 500g, but the rider is at 100g → so 100 grams

That would make total 90 + 100 + ? = 190 + ?

But that suggests the middle beam is for hundreds — but then why does it go to 500?

Ah — perhaps the middle beam is for 100g increments, so it's the hundreds beam.

But in standard design, the rear beam is 0–100g (for hundreds), the middle is 0–100g (for tens), and the front is 0–10g (for ones).

But here, the top beam is 0–100g → so it's the hundreds beam → rider at 90g → 90 grams

The middle beam is 0–500g → but the rider is at 100g → so 100 grams? That would be 100 × 10 = 1000g? No — that doesn’t make sense.

Wait — I think I'm misreading.

Let me reinterpret based on common triple beam balance design.

Actually, in most triple beam balances:
- The rear beam (top) is 0–100g, with 10g increments → so it measures tens of grams
- The middle beam is 0–100g, with 1g increments → measures ones of grams
- The front beam is 0–10g, with 0.1g increments → measures tenths

But in this image:

- Top beam: 0 to 100g → rider at 90g → so 90 grams → this is 90g → but that’s not 90 × 10.

Wait — no — the top beam is calibrated in 100g increments, so each mark is 10g? No — it's labeled 0, 10, 20, ..., 100 → so each major division is 10g.

But the rider is at 90g, so that’s 90 grams.

Then the middle beam: 0 to 500g → but it's labeled 0, 100, 200, 300, 400, 500 → so each major division is 100g → so the rider is at 100g → so 100 grams

Then the bottom beam: 0 to 10g → rider at 1.4g → so 1.4 grams

Total = 90 + 100 + 1.4 = 191.4 grams

So the answer is C) 191.4 grams

But wait — that seems high. Let’s check the actual positions.

Looking again:

- Top beam (rear): 0 to 100g → rider at 90g → so 90 grams
- Middle beam: 0 to 500g → rider at 100g → so 100 grams
- Front beam: 0 to 10g → rider at 1.4g → so 1.4 grams

Total = 90 + 100 + 1.4 = 191.4 grams

Yes — so the correct reading is 191.4 grams

But is the middle beam really 100g? Or is it meant to be the tens beam?

Wait — in reality, the middle beam is usually for 100g increments, but the scale is only 0–100g, and each division is 10g.

But here, the middle beam is labeled 0 to 500g, which is unusual.

Wait — perhaps the middle beam is for 100g increments, and the rider is at 100g, meaning 100 grams.

But that would mean the total is 90 + 100 + 1.4 = 191.4g

Alternatively, maybe the middle beam is for tens of grams, and the rider is at 100 on a 0–500 scale → that would be 100 × 10 = 1000g? That can’t be.

No — that doesn’t make sense.

I think the labeling is confusing.

Let’s look at the positions:

- Top beam: rider at 90g → so 90 grams
- Middle beam: rider at 100g → but the scale is 0 to 500g → so it’s 100 grams
- Bottom beam: rider at 1.4g → so 1.4 grams

Total = 90 + 100 + 1.4 = 191.4 grams

So the correct answer is C) 191.4 grams

But let’s confirm with a standard method.

Standard triple beam balance reading:

- Rear beam (top): 0–100g → 10g increments → rider at 90g → 90g
- Middle beam: 0–100g → 1g increments → rider at 100g → 100g? But that would be 100g, but typically the middle beam is 0–100g with 10g increments.

Wait — confusion.

Actually, in many diagrams:

- The rear beam is 0–100g → each division is 10g → rider at 90g → 90g
- The middle beam is 0–100g → each division is 10g → rider at 100g → 100g
- The front beam is 0–10g → each division is 0.1g → rider at 1.4g → 1.4g

But then total is 90 + 100 + 1.4 = 191.4g

But that’s 191.4 grams

But wait — the middle beam is labeled 0 to 500g — so it must be measuring hundreds of grams.

So the middle beam is for 100g increments, and the rider is at 100g, meaning 100 grams

Then top beam is 0–100g → rider at 90g → 90 grams

Then bottom beam is 0–10g → rider at 1.4g → 1.4 grams

Total = 90 + 100 + 1.4 = 191.4 grams

Yes.

But in some designs, the top beam is for 100g increments, so 90g means 90g, not 900g.

So yes.

Therefore, the correct reading is 191.4 grams

Answer: C) 191.4 grams

✔ Final Answer: C) 191.4 grams