Question

Sally is saving money to buy a new computer. The computer costs $689. She has saved $125, and each week she adds $25 to her savings. Assuming that she deposits her money once a week, how many weeks will it take her to save enough money to buy the computer?

A) 17 weeks
B) 22 weeks
C) 23 weeks
D) 24 weeks

Answer 1

Answer: C) 23 weeks

Explanation:

Given: The cost o0f computer = $689

The amount sally saved = $125

The amount sally saved each week to her savings = $25

Let x be the number of weeks it will take her to save enough money to buy the computer.

Then
`25x+125\geq689\\\\\Rightarrow\ 25x\geq564\\\\\Rightarrow\ x\geq22.56\\\Rightarrow\ x=23`

In 23 weeks, Sally will save enough money to buy the computer.