- #1
zak100
- 462
- 11
Hi,
I got the following problem from a GRE book. They have provided a method but i am trying to solve it using a different method. My answer is wrong.
Q.A jar contains 10 red marbles & 30 green ones. How many red marbles must be added to the jar so that 60% of the marbles will be red?Sol. Current percentage of red marbles is:
10/40 * 100 = 25%
This means we have to add 35% more red marbles:
x/(x+40) * 100 = 35
100x = 35x + 1400
65x = 1400
X= 22 (Answer is not correct).Some body please guide me what is my mistake.Zulfi.
I got the following problem from a GRE book. They have provided a method but i am trying to solve it using a different method. My answer is wrong.
Q.A jar contains 10 red marbles & 30 green ones. How many red marbles must be added to the jar so that 60% of the marbles will be red?Sol. Current percentage of red marbles is:
10/40 * 100 = 25%
This means we have to add 35% more red marbles:
x/(x+40) * 100 = 35
100x = 35x + 1400
65x = 1400
X= 22 (Answer is not correct).Some body please guide me what is my mistake.Zulfi.