Question

9Philip is saving money to buy a new computer. He saves the same amount ofmoney each week.After 2 weeks of saving, Philip still needs $520 to buy the computer.After 6 weeks of saving, Philip still needs $300 to buy the computer.How much does the computer cost?

Answer 1

First let's calculate how much money Philip saves each week.

In 4 weeks, he saved 520 - 300 = $220, so he saved 220/4 = $55 per week.

Then, we have that after 2 weeks of saving, he still needed $520, so before this saving, he needed:

$\begin{gathered} 520+2\cdot55 \\ =520+110 \\ =630 \end{gathered}$

So the computer costs $630.