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The maximum recommended pulse rate R when exercising, for a person who is x years of age is given by the equation...

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by BTGmoderatorLU » Tue Dec 01, 2020 4:55 am

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The maximum recommended pulse rate R when exercising, for a person who is x years of age is given by the equation R= 176- 0.8x. What is the age, in years, of a person whose maximum recommended pulse rate when exercising is 140?

A. 40
B. 45
C. 50
D. 55
E. 60

The OA is B
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Re: The maximum recommended pulse rate R when exercising, for a person who is x years of age is given by the equation...

by Brent@GMATPrepNow » Tue Dec 01, 2020 6:54 am
BTGmoderatorLU wrote: ↑
Tue Dec 01, 2020 4:55 am
 Source: Official Guide

The maximum recommended pulse rate R when exercising, for a person who is x years of age is given by the equation R= 176- 0.8x. What is the age, in years, of a person whose maximum recommended pulse rate when exercising is 140?

A. 40
B. 45
C. 50
D. 55
E. 60

The OA is B
Given: Max pulse rate = 176 - 0.8x

So, if Max pulse rate = 140, we get: 140 = 176 - 0.8x
Subtract 176 from both sides of the equation to get: -36 = -0.8x
Solve: x = -36/(-0.8) = 45

Answer: B

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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