A builder was building a fence. In the morning, he worked for 2/5 of an hour. In the afternoon, he worked for 9/10 of an hour. How many times as long as in the morning did he work in the afternoon? Hint: set-up and solve a division problem to help answer the question. He worked and / times longer in the afternoon as he did in the morning. (Write your answer as a mixed number) You may not use a calculator.

2 1/4 times

Explanation:

Number of hours worked in the morning = 2/5 of an hour

Number of hours worked in the afternoon = 9 / 10 of an hour

How many times as long as in the morning did he work in the afternoon?

= Number of times he worked in the afternoon / number of times he worked in the morning

= 9/10 ÷ 2/5

= 9/10 × 5/2

= 45 / 20

= 2 5/20

= 2 1/4 times

1-5 2-7 3-4

explanation:

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.