SOLUTION: At Scott's Laundromat, the washing machines accept only quarters and nickels. If Joe used 20 coins worth $2.60 to wash 4 loads, how many of each coin did he use?
A. 7 quarter
Question 939394: At Scott's Laundromat, the washing machines accept only quarters and nickels. If Joe used 20 coins worth $2.60 to wash 4 loads, how many of each coin did he use?
A. 7 quarters and 13 nickels
B. 6 quarters and 14 nickels
C. 8 quarters and 12 nickels
D. 9 quarters and 11 nickels Answer by srinivas.g(540) (Show Source): You can put this solution on YOUR website! 1 nickle = 0.05 dollars
1 quarter =0.25 dollars
let x be the no of nickles
let y be the no of quarters
total no of coins =20
x+y = 20..............eq(1)
total worth = $ 2.60
x*0.05+y*0.25 = $2.60 ..............eq(2)
Solve: We'll use substitution. After moving 1*y to the right, we get: , or . Substitute that
into another equation: and simplify: So, we know that y=8. Since , x=12.
Answer: .
Result : nickles =12
quarters = 8
Option : C is the right choice