Gina owes her father $200. During each week, she pays $20. How long will it take for Gina to pay her father back all the money she borrowed.

Answer 1

Make x = weeks (to pay Dad back)

Assume she pays him back 20 dollars/week AND x = weeks (to pay Dad back)

Then 20(x) = 200,

Rewrite & solve for x, so x = 200/20 = 10 weeks to pay him back

With these kind of problems, noting the units (like dollars/week, weeks, dollars) is helpful to figure out how to get the final unit you want. Notice that in 20x the unit of week cancels out leaving dollars.

Hope this helps...

Answer 2

$200 - 20n = ?