Normally Ann can frost a cake in 5 minutes. However, today she has a sprained wrist and it takes her 8 minutes to frost a cake. How much longer would it take her to frost 10 cakes with her sprained wrist?
Let's be accurate as possible and think first.
30
Normally, it would take her 5 * 10 = 50 minutes.

With her sprained wrist it will take her 8 * 10 = 80 minutes.

80 - 50 = 30 more minutes.

.

So, the answer is 30