Question

If Skyler can grade 120 math tests in 40 minutes, how many can she grade in 60 minutes?

plz show work , thx .

Answer 1

180 math tests

Explanation:

Let's make a proportion

She can grade 120 math tests in 40 minutes, and x math tests in 60 minutes

test/minutes=test/minutes

120/40=x/60

Cross multiply

120*60=40*x

7200=40x

Since we are trying to find x, we have to get x by itself. 40 and x are being multiplied. To undo this, divide both sides by 40

7200/40=40x/40

180=x

So, she can grade 180 math tests in 60 minutes