Question

You're making cookies for a party. 1 of every 20 cookies falls apart. if you make 40 cookies how many will fall apart?

Answer 1

On average, 2 will fall apart. We can tell this by making a proportion.

1/20 = x/40 ---> cross multiply
1*40 = 20*x ---> multiply
40 = 20x ----> divide by 20
2 = x

Answer 2

2 cookies would be fall apart.

Explanation:

Given,

1 of every 20 cookies falls apart.

Thus, we can write,

20 cookies = 1 cookie fall apart,

2 × ( 20 cookies ) = 2 × (1 cookie fall apart ),

⇒ 40 cookies = 2 cookies fall apart

Hence, if 40 cookies were made, 2 cookies would be fall apart.