Answer
20 weeks
Explanation:
given total is 195.75 that she needs.
she has 40
so you take 40 from the 195.7 = 155.70
you are then told she will save an additional 8 each week
and they want to know how many weeks it will take
155.70/8 a week = 19.46 weeks to gain enough money
i would imagine you will need to round up b/c it will take that 20th week to have the remaining balance
check work:
total needed 195.70
has 40
8 a week multiplied by nineteen weeks = 152.00
remaining needed is 3.70 meaning one more week
195.70
-40
-152
= 3.70
1 more week needed so 20 weeks total to save