+0  
 
0
68
1
avatar

A coin bank contains $3.20.There are twice as many nickels as quarters and half as many dimes as quarters.How many nickels are there in the coin bank?

 Jun 17, 2020
 #1
avatar+980 
+2

Lets say there are q quarters.

 

There are 2q nickels, and q/2 dimes.

 

2q * 0.05 + (q/2)0.1 + 0.25q = 3.2

 

0.1q + 0.05q + 0.25q = 0.4q = 3.2

 

q = 3.2/0.4 = 32/4 = 8

 

8 quarters, 16 nickels, 4 dimes

 

8*0.25 = 2, 16*0.05 = 0.8, 4*0.1 = 0.4, correct!

 Jun 17, 2020

28 Online Users

avatar