1. A carpenter can lay 42 bricks in 2 hours, working at a constant rate. How many bricks can he lay for every 1 hour?

Answer 1

Let's set this up as a ratio so you can see what's happening:

^{42 bricks} / _{2 hours} = ^{? bricks} / _{1 hour}

As we are halving the time (going from 2 hours to 1 hour), we can similarly halve the number of bricks. Divide 42 by 2 and you will have your final answer: