# Cristiano is saving money to buy a bike that costs $189. He has saved $99 so far. He plans on saving $10 each week. In how many weeks will he have enough money to buy the bike?

##### 1 Answer

Dec 17, 2016

It will take Cristiano 9 weeks to have enough money.

#### Explanation:

We can write a formula for this problem as:

$189 is the total amount Cristiano need.

$99 is what Cristiano already has.

$10w is the $10 per week Cristiano plans on saving for

Solving for