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16-11-2020
Mathematics

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Rob has 40 coins, all dimes and quarters, worth $7.60. Write the system needed to determine the
number of dimes and quarters.

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16-11-2020

Answer:d + q = 40 -----> d = 40 - q

10d + 25q = 760

Substitute!

10(40 - q) + 25q = 760

400 - 10q + 25q = 760

15q = 360

q = 24

d = 40 - 24

d = 16

Step-by-step explanation:

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