Lulu tells her little brother, Jack, that she is holding 20 coins all of which are dimes and quarters. They have a value of $4.10. She says she will give him the coins if he can tell her how many of each she is holding.

Question

Mathematics

Amari Pacheco

27 September, 23:11

Lulu tells her little brother, Jack, that she is holding 20 coins all of which are dimes and quarters. They have a value of $4.10. She says she will give him the coins if he can tell her how many of each she is holding.

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Answers (1)

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Patricia Mayo · Answer 1

Q+d=20, d=20-q ...

25q+10d=410, and using d from above in this equation gives you:

25q+10 (20-q) = 410

25q+200-10q=410

15q+200=410

15q=210

q=14, and since d=20-q

d=6

So Lulu has 14 quarters and 6 dimes.