Nina has some money saved for a vacation she has planned. The vacation will cost a total of $1600. She will put $150 every week into her account to help pay for the vacation. She will hav enough money for the vacation in 8 weeks. If Nina was able to save $200 a week instead of $159 a week, how many fewer weeks would it take her to save money for the vacation

To answer this question you will want to know how much money she started with.

If she saves $150 a week for 8 weeks, this is 150 x 8 or $1200. This means she started with $400.

If she saves $200 a week beginning with $400, this will take her 6 weeks of saving. (-$1600 -$400 = $1200; $1200/$200 = 6 weeks of saving).