Molly and Liza are exercising. Molly does 10 push -ups at the same time as Liza does 15 push -ups . When Molly does 40 push - ups , how many push - ups does Liza do ?

By the time that Molly does 40 push-ups, Liza would have done 60.

This is solved simply by multiplying 15 by 4.

How did we get "15 x 4?"

Well, to get Molly's number of push-ups, we would have to see how many times Molly's original number, 10, could go into the end result, 40.

To get that, we would have to divide 40 into 10; which is 4.

So, we would multiply Liza's original number, 15, by 4.

Which would equal 60.

Hope this helps! <3

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