IDNLearn.com provides a collaborative environment for finding and sharing knowledge. Get thorough and trustworthy answers to your queries from our extensive network of knowledgeable professionals.
Answer:
Step-by-step 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.