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Dave Bowers collects U.S. gold coins. He has a collection of 43 coins. Some are​ $10 coins, and the rest are​ $20 coins. If the face value of the coins is ​$620​, how many of each denomination does he​ have?

Respuesta :

Answer:

Step-by-step explanation:

20X+10(41-X)=540

20X+410-10X=540

10X=540-410

10X=130

X=130/10

X=13 ANS. FOR THE NUMBER OF $20 COINS.

41-13=28 ANS. FOR THE NUMBER OF $10 COINS.

PROOF:

20*13+10*28=540

260+280=540

540=540

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