Question

in 15 minutes lena can finish 2 math homework problems. how many math problems can she finish in 75 minutes?

Answer 1

Lena would be able to finish 10 math homwork problems. 15*5 equals 75. So multiply 2 by 5 and thats how many problems Lena can do in 75 minutes.

Answer 2

Set up a proportion.
(x is the amount of problems she can do in 75 mins)

$\frac{2}{15} = \frac{x}{75}$

Now, to find 'x', we need to have it on its own, so we multiply by 75 on both sides.

$\frac{2}{15}$ × $75 = x$

The answer is 10, as $\frac{2}{15}$ multiplied by 75 is 10.