Solve the following word problems: Calculate total lengths, volumes, heights, and masses using decimal arithmetic.

Here are the step-by-step solutions for each problem.

Problem 1: The Ribbons

Step 1: Find the length of Sharon's ribbon.
Sharon's ribbon is 3.8 metres shorter than Jasmine's (12.6 metres).
$$12.6 - 3.8 = 8.8 \text{ metres}$$

Step 2: Find the total length.
Add Jasmine's length and Sharon's length together.
$$12.6 + 8.8 = 21.4 \text{ metres}$$

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Problem 2: The Jugs

Step 1: Find the volume of water in Jug B.
Jug B has 0.79 litres less than Jug A (2.17 litres).
$$2.17 - 0.79 = 1.38 \text{ litres}$$

Step 2: Find the total volume.
Add the water from Jug A and Jug B together.
$$2.17 + 1.38 = 3.55 \text{ litres}$$

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Problem 3: The Trees

Step 1: Find the height of the mango tree.
The mango tree is 3.4 metres shorter than the coconut tree (7.6 metres).
$$7.6 - 3.4 = 4.2 \text{ metres}$$

Step 2: Find the total height.
Add the height of both trees together.
$$7.6 + 4.2 = 11.8 \text{ metres}$$

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Problem 4: The Sacks of Potatoes

Step 1: Find the mass of potatoes in Sack B.
Sack B contains 3.7 kg more than Sack A (32.5 kg).
$$32.5 + 3.7 = 36.2 \text{ kg}$$

Step 2: Find the total mass.
Add the mass of Sack A and Sack B together.
$$32.5 + 36.2 = 68.7 \text{ kg}$$

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Final Answer:
1. 21.4 metres
2. 3.55 litres
3. 11.8 metres
4. 68.7 kg