Question

Lily is using dark power crystal to raise an army of zombies. Each crystal can raise 9 zombies. How many crystals does Lily need to 6,174 zombies?

Answer 1

686 crystals

Explanation:

We can use ratios to solve

1 crystal x crystals

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

9 zombies 6174 zombies

Using cross products

9x = 6174

Divide each side by 9

x = 6174/9

x =686