Question

Ritz can eat 8 apples in 15 minutes.how long does it take ritz to eat 16 apples at the same rate.

Answer 1

if 8 apples takes 15 mins then 16 would take 30 mins because 8 is half of 16 so if you double the time it would be your answer

Answer 2

We can answer the problem using a rule of three, simple, direct proportion and also using fractions. First the rule of three:
8 apples ------> 15 min
16 apples ----> x

x = (16)(15)/8
x = 30
therefore he can eat 16 apples in 39 minutes.

We can also equate fractions like so:
8/15 = 16/y
and solve for y:
y = 15*16/8
y = 30
the same answer