The speed of a baseball pitcher's fastball is 92.4 miles per hour. His fastball is 10% faster than his curveball, and his curveball is 5% faster than his change - up.

Part A: how fast is the pitcher's curveball? The choices are A: 84 miles per hour B: 86 miles per hour C: 88 miles per hour D: 90 miles per hour

Part B: how fast is the pitcher's change-up? The choices are A: 76 miles per hour B: 78 miles per hour C: 80 miles per hour D: 82 miles per hour

Question

Jamie Ellis

Mathematics

12 March, 14:20

The speed of a baseball pitcher's fastball is 92.4 miles per hour. His fastball is 10% faster than his curveball, and his curveball is 5% faster than his change - up.

Part A: how fast is the pitcher's curveball? The choices are A: 84 miles per hour B: 86 miles per hour C: 88 miles per hour D: 90 miles per hour

Part B: how fast is the pitcher's change-up? The choices are A: 76 miles per hour B: 78 miles per hour C: 80 miles per hour D: 82 miles per hour

+2

Answers (1)

Know the Answer?

Agustin Lutz · Answer 1

Part A:

92.4*0.10

= 9.24

92.4-9.24

= 83.16

A

Part B:

83.16*0.05

= 4.158

83.16-4.158

= 79.002

B

The trick to percentages is to put a decimal behind the percent sign and multiply.

So 10% of 10 would be. 10 times 10, or 1.

5% of 100 would be. 05 times 100, or 5.