A collection of quarters and nickels is worth $3.75. There are 27 coins in all. Find how many of each there are.

Question

Hudson Cameron

Mathematics

3 June, 13:30

A collection of quarters and nickels is worth $3.75. There are 27 coins in all. Find how many of each there are.

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Answers (1)

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Jazlene Burton · Answer 1

Q + N = 27

Q=27-N

0.25Q + 0.05N = 3.75

0.25 (27-N) + 0.05 = 3.75

6.75-0.25N+0.05N=3.75

6.75-0.2N=3.75

-0.2N=-3

N=-3/-0.2 = 15

15 nickels

27-15 = 12

12 quarters

15x0.05 = 0.75

12 x 0.25 = 3.00

3.00 + 0.75 = 3.75

12 quarters & 15 nickels