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A collection of 16 coins, each with a face value of either 10 cents or 25 cents, has a total face value of...

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by AAPL » Thu Sep 03, 2020 10:24 am

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A collection of 16 coins, each with a face value of either 10 cents or 25 cents, has a total face value of $2.35. How many of the coins have a face value of 25 cents?

A. 3
B. 5
C. 7
D. 9
E. 11

OA B
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Re: A collection of 16 coins, each with a face value of either 10 cents or 25 cents, has a total face value of...

by Scott@TargetTestPrep » Tue Sep 08, 2020 9:40 am
AAPL wrote: ↑
Thu Sep 03, 2020 10:24 am
 Official Guide

A collection of 16 coins, each with a face value of either 10 cents or 25 cents, has a total face value of $2.35. How many of the coins have a face value of 25 cents?

A. 3
B. 5
C. 7
D. 9
E. 11

OA B
Solution:

We can let the number of 10-cent coins = d and the number of 25-cent coins = q. We are given that there are 16 total coins; thus, d + q = 16.

We are also given that the total face value is $2.35; thus:

0.1d + 0.25q = 2.35

10d + 25q = 235

Isolating d in our first equation, we have d = 16 - q. We can substitute 16 - q for d in our second equation, and we have:

10(16 - q) + 25q = 235

160 - 10q + 25q = 235

15q = 75

q = 5

There are 5 coins with a face value of 25 cents.

Answer: B

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