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A piggy-bank has some 10-cent coins and one-dollar coins. The total value of the 10-cent coins is equal to the total value of the one-dollar coins. If there are 88 coins in all, how many 10-cent coins are there altogether?

 

Tip: How many 10-cent coins will make $1?

 Jul 6, 2021
 #1
avatar+121047 
+1

Let  x  be  the number of   10 cent  coins   and   88 - x  the  number of 1 dollar  coins

 

So

 

.10x =   1 ( 88 - x)

 

.10x  =  88- x

 

x + .10x = 88

 

1.1 x  = 88

 

88 / 1.1   = x  =  80       (10 cent coins)

 

 

cool cool cool

 Jul 6, 2021

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