Question

The ratio of whole milk bottles to skim milk bottles at the dairy was 3 to 7. If there were 210 bottles of skim milk, how many bottles of whole milk were there?

Answer 1

Given:

The ratio of whole milk bottles to skim milk bottles is,

$3\colon7$

There are 210 bottles of skim milk.

let x be the number of bottles of whole milk.

$\begin{gathered} 3\colon7=x\colon210 \\ \frac{3}{7}=\frac{x}{210} \\ x=\frac{3\times210}{7} \\ x=3\times30 \\ x=90 \end{gathered}$

Answer: There are 90 bottles of whole milk.