Question

8. Jack has twice as many dimes as quarters. If the total

value of the coins is $6.30, how many dimes does he
have?
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Answer 1

Explanation:

d=2q, q=d/2

10d+25q=630, using q=d/2

10d+25d/2=630

20d+25d=1260

45d=1260

d=28

So he has 28 dimes.