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15 quarters & 20 dimes

Let x be the # of dimes & y be the # of quarters. Then set up two equations & solve using substitution method.

(1) x + y = 35 total number of coins

(2) 0.10x + 0.25y = 5.75 total number of money

Rearrange first equation in terms of y & substitute into second equation & solve:

y = 35 - x

0.10x + 0.25(35-x) = 5.75

0.10x + 8.75 - 0.25x = 5.75

-0.15x = 5.75-8.75

-0.15x = -3

x = -3/-0.15 = 20

Now substitute value for x into 1st equation to find # of quarters (y):

20 + y = 35

y = 35 - 20 = 15

Checking the answer:

20*$0.10 + 15*$0.25

$2.00 + $3.75 = $5.75

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โˆ™ 2011-12-15 19:45:08
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Q: James has 35 coins in his pocket all of them dimes and quarters If he has a total of 5.75 how many quarters does he have?
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