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lakkis [162]
3 years ago
7

A jar contains n nickels and d dimes there are 20 coins in the jar, and the total value of the coin s is one dollar and forty ce

nts. how many nickels and how many dimes are in the jar?
Mathematics
1 answer:
Lesechka [4]3 years ago
3 0
A) n + d = 20
B) .05n + .10d = 1.40 Multiplying A) by -.10
A) -.1n  -.1d = -2      Then adding it to B
B) .05n + .10d = 1.40
-.05n = -.60
n = 12 nickels
d = 8 dimes


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