Homework Help: Math

Posted by alex on Saturday, August 13, 2011 at 2:38pm.

There are 150 green marbles and 100 yellow marbles in a bag that contains 250 marbles. If only yellow marbles are added to the bag so that the probability of randomly drawing a yellow marble from the bag becomes 3/5, how many yellow marbles are in the bag?

Math - Damon, Saturday, August 13, 2011 at 3:10pm
g = 150
y = 100 + x

total = 100 + x + 150 = 250+x
(100 + x) /(250+x) = 3/5

5(100+x) = 3(250+x)
Math - alex, Saturday, August 13, 2011 at 4:25pm
x = 125
Math - Damon, Saturday, August 13, 2011 at 8:12pm
yes

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