Problem 19: Four pencils cost 76p altogether. We need to find the cost of one pencil. Problem 20: There are 81 children in 3 equal size classes. We need to find the number of children in each class.

1. Problem Description

Problem 19: Four pencils cost 76p altogether. We need to find the cost of one pencil.

Problem 20: There are 81 children in 3 equal size classes. We need to find the number of children in each class.

2. Solution Steps

Problem 19:

To find the cost of one pencil, we need to divide the total cost by the number of pencils.

Cost of one pencil = Total cost / Number of pencils

Cost of one pencil = $76 / 4$

$76 / 4 = 19$

Problem 20:

To find the number of children in each class, we need to divide the total number of children by the number of classes.

Number of children in each class = Total number of children / Number of classes

Number of children in each class = $81 / 3$

$81 / 3 = 27$

3. Final Answer

Problem 19: 19 p

Problem 20: 27