Bert can weed the garden in 3 hours. If Bert and Ernie work together, they can finish the job in 2 hours. How long would it take Ernie to do the job by himself? Letting x equal the number of hours it takes Ernie to do the job by himself, write and solve an equation.

Step-by-step explanation:

Both of them finish in an hour 1/2 of the job.

Bert finishes 1/3 of the job in an hour.

So Ernie can do in an hour 1/2-1/3=1/6 of the job.

This way we understand that Ernie needs 6 hours to finish the job.

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls

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