Diane has $1.20 in dimes and nickels. she has a total of 13 coins. how many of each kind does she have?

Question

Mathematics

Cody Rodriguez

14 May, 10:11

Diane has $1.20 in dimes and nickels. she has a total of 13 coins. how many of each kind does she have?

+5

Answers (1)

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Sophie · Answer 1

Yeah

120cents

10d+5n=120

divide both sides by 5

2d+n=24

13 coins

n+d=13

we have

2d+n=24 and

d+n=13

muliptly 2nd equation by - 1 and add to first

2d+n=24

-d-n=-13 +

d+0n=11

d=11

d+n=13

11+n=13

n=2

11 dimes

2 nickles