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20 Nov 2005, 12:58
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Q: A certain jar contained only pennies and nickles. After 3 pennies were removed. how many nickels remained in the jar?
1. The original ration of pennies to nickles in the jar was 7:4
2. After the 3 pennies were removed, the ratio of pennies to nickles in the jar was 3:2
1. The original ration of pennies to nickles in the jar was 7:4
2. After the 3 pennies were removed, the ratio of pennies to nickles in the jar was 3:2
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20 Nov 2005, 13:17
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C. 9
P : number of pennies initially
N : number of nickels initially
(1) P/N = 7/4
from ratio we cannot find exact value. insufficient
(2) (P-3/N) = 3/2
or 2P - 3N = 6
insufficient. 2 variables 1 eqn
together: 2 variables, 2 eqns
N = 12
N-3 = 9
P : number of pennies initially
N : number of nickels initially
(1) P/N = 7/4
from ratio we cannot find exact value. insufficient
(2) (P-3/N) = 3/2
or 2P - 3N = 6
insufficient. 2 variables 1 eqn
together: 2 variables, 2 eqns
N = 12
N-3 = 9
