Question

Marina can make 36 cupcakes in 45 minutes. How long will it take for her to make 108 cupcakes?

Answer 1

Answer:
135 minutes

Explanation:
36 cupcakes in 45 minutes can be written as $\frac{36}{45}$, so to find how long 108 will take, you can find it by equating these two fractions:
$\frac{36}{45}$ = $\frac{108}{x}$ 
Simplify by cross division:
divide 45 and 108 by 3 to simplify into this:
$\frac{36}{15}$ = $\frac{36}{15}$
x = 15 
The rate is 3, so 45 • 3 = 135 minutes.

Another way of looking at it is this:
108 ÷ 36 = 3 this is the rate that you need to multiply the amount of time that it takes to make the cupcakes, so:
45 • 3 = 135 minutes.

Answer 2

Two Hours and 40 min