SOLUTION: bob has 60 coins consisting of quarters and dimes. The coins combined value is $9.45. Find out are many are quarters and how many are dimes.

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Question 269813: bob has 60 coins consisting of quarters and dimes. The coins combined value is $9.45. Find out are many are quarters and how many are dimes.
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
(i) D+%2B+Q+=+60
(ii) 10D+%2B+25Q+=+945
step 1 - multiply (i) by -10 to get
(iii) -10D+-+10Q+=+-600
step 2 - add (ii) and (iii) to get
(Iv) 15Q+=+345
step 3 - divide by 15 to get
Q+=+23
This means
D+=+37