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I had a total of 80 pieces of 20¢ coins or 50¢ coins in a box. I used 50% of 20¢ coins and 25% of 50¢ coins to buy a book and had 46 coins left. (a) Find the percentage of the number of 20¢ coins at first. (b) Find the cost of the book.

 Aug 5, 2021
 #1
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number of 20c coins = x

number of 50c coins = 80-x

1/2(x) + 1/2(80-x) = 80 - 46

 

Solve for x :))

 

=^._.^=

 Aug 6, 2021

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