buy red and green

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buy red and green

by sanju09 » Fri May 14, 2010 2:03 am
Roman, Bob and Roger buy red and green marbles. Red and green marbles don't have the same price. Roman pays 70 ¢ for four red marbles and two green marbles. Bob pays 95 ¢ for two red marbles and five green marbles. How much will Roger pay if he buys one red marble and one green marble?
(A) 15 ¢
(B) 20 ¢
(C) 25 ¢
(D) 30 ¢
(E) 35 ¢
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by gmatjedi » Fri May 14, 2010 3:54 am
25 c

r= red
g= green

4r+2g=.70
2r+5g=.95

simultaneous equation with
g=0.15 & r=0.1