Question

How much would a set of seven rocks cost if I paid $350 for 28 rocks

Answer 1

$87.50

Explanation:

We can find the price by dividing 350 by 4, since 28 divided by 4 is 7.

350/4

= 87.5

So, a set of seven rocks would be $87.50

Answer 2

87.50

Explanation:

We can use ratios to solve

28 rocks 7 rocks

-------------- = ------------------

350 dollars x dollars

Using cross products

28x = 350*7

Divide each side by 38

x = 350*7/28

x =87.5