Question

If Mary starts with $10 in her savings account and wants to add $20 each week to save for a new phone that costs $150 how many weeks will she need to save

Answer 1

Explanation:

x = number of weeks she needs to save.

$20x + 10 = 150

20x + 10 -10 = 150 -10

20x = 140

Divide each side by 20

20x/20 = 140/20

x = 7

She needs to save for 7 weeks.