Grade 3 math worksheet on writing equations with variables.

I'll solve each problem step by step.

Problem 1:
Sean got m marks for his math test. Emma got 15 more marks than Sean. Emma's score is 94.

Let me work through this:
- Sean's score = m
- Emma got 15 more than Sean, so Emma's score = m + 15
- We know Emma's score is 94
- So: m + 15 = 94

To find m:
m + 15 = 94
m = 94 - 15
m = 79

Problem 2:
There are 6 books on the desk and b books on the shelf. There are 37 books in total.

Let me work through this:
- Books on desk = 6
- Books on shelf = b
- Total books = 37
- So: 6 + b = 37

To find b:
6 + b = 37
b = 37 - 6
b = 31

Problem 3:
The admission for a water park for an adult is 9 dollars. The admission for a child is x dollars, which is 4 dollars cheaper than the adult admission.

Let me work through this:
- Adult admission = $9
- Child admission = x dollars
- Child admission is $4 cheaper than adult admission
- So: x = 9 - 4

x = 9 - 4
x = 5

Final Answer:
1. m = 79
2. b = 31
3. x = 5