(A) 1:5
(B) 2:7
(C) 3:8
(D) 1:10
Correct Option is: A
1) 20% profit at the price of 7 cents means that cost of the mixture should be 70/12 cents per ounce (7 =
120% and x = 100% => x = 7*100/120)
2) Let the amount of 5 cent rice will be x and the amount of 6 cent one – y. The price of ounce of mixture will
be: (5x + 6y)/(x + y), which as we know should equal to 70/12
3) (5x + 6y)/(x + y) = 70/12 => x/y = 1/5