I have some coins, and 15 of them are nickels. The ratio of nickels to dimes is 3 : 2, and the ratio of dimes to quarters is 5 :
4. How many quarters do I have?
1 answer:
Nidkles=15=3 units
divide by 3
1 unit=5
2 units =dimes=5*2=10
dimes to quarters is 5:4
dimes=10=5 units
divide by 5
2=1 unit
quarters=4 units
2*4=8
8 quarters
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Answer:
x = nickels
y= dimes
x + y = 34
.05x + .10y= $1.90
-.10x - .10y = -3.40
-.05x + .10y = 1.90
-.05x = -1.50
x = 30 nickels
30 + y = 34
y = 4 dimes
(3,4)