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25-12-2017
Mathematics

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Ron has 13 coins with a total value of $2.25. the coins are nickels and quarters. how many of each coin does he have

Respuesta :

25-12-2017

8 quarters = $2.00
5 nickles = $0.25

Total ... 13 coins = $2.25

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Аноним Аноним

25-12-2017

n-nickels, q-quarters

n+q=13=>n=13-q

0.25q+0.05n=2.25
0.25q+0.05(13-q)=2.25
0.25q+0.65-0.05q=2.25
0.20q=2.25-0.65
0.20q=1.6
q=1.6:0.2
q=8
n=13-8
n=5

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