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15-10-2017
Mathematics

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A jar contains n nickels and d dimes. There are 20 coins in the jar, and the total value of the coins is $1.40. How many nickels and how many dimes are in the jar?

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15-10-2017

n = number of nickels
d = number of dimes

n+d = 20
0.05n + 0.10d =1.40

-0.05n - 0.05d = -1
0.05n + 0.10d = 1.40

0.05d = 0.40
d = 8

n = 20-8=12

There are 12 nickels and 8 dimes

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