Question

I am saving for a bike that costs 203.89$. I have $30, and plan to save $5 every week. My aunt decides to give you an additional $10 per week. How much weeks do I need to save to buy the bike?

Answer 1

The cost of the bike = $203.89

So, you have $30 and you will have per week ( 5 + 10 ) = $15 per week

let the number of weeks = x

So, after x weeks you will have (30 + 15x)

so,

30 + 15x = 203.89

15 x = 203.89 - 30

15 x = 173.89

divide both sides by 15

x = 173.89/15 = 11.6 (rounding to the nearest 1 decimal )

But the number of weeks is integer

so, x = 12

So, after 12 weeks you will able to buy the bike.