How Long Will a 18 Ounce Shampoo Bottle Last?

Mike has a 12 ounce shampoo bottle that lasts him 16 weeks. If he switches to an 18 ounce bottle of the same brand, how long would you expect it to last him?

a) About 24 weeks

b) About 18 weeks

Answer:

The correct answer is: a) About 24 weeks

In this case, we can use a proportion based on the given data to calculate how long Mike would use an 18-ounce shampoo bottle of the same brand.

Let's set up the ratio:

12 ounces / 16 weeks = 18 ounces / x weeks

Cross-multiply to solve for x:

12 * x = 18 * 16

12x = 288

Divide by 12 to find x:

x = 288 / 12

x = 24

Therefore, Mike should get about 24 weeks out of an 18-ounce bottle of the same brand.