4 years ago

Lily saved 16 coins. She saved ten-can and one-dollar coins only. If she had $5.20, how many ten-cent coins did she have?

Mathematics

1 answer:

Firlakuza [10]4 years ago

4 0

Answer:

Step-by-step explanation:

Let d represent the number of dimes Lily saved. Then the value of her coins in cents is ...

10d +100(16-d) = 520

-90d +1600 = 520 . . . . . eliminate parentheses, collect terms

-90d = -1080 . . . . . . . . . . subtract 1600

d = -1080/-90 = 12 . . . . . divide by the coefficient of d

Lily has 12 ten-cent coins.

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