One test tube contains some acid and another test tube contains an equal quantity of water To prepar...........

Quantitative Aptitude ( CCS) Mixture and Alligation

One test tube contains some acid and another test tube contains an equal quantity of water. To prepare a solution, 20 g of the acid is poured into the second test tube. Then, two-thirds of the so formed solution is poured from the second test tube into the first. If the fluid in the first test tube is four times that in second, what quantity of water was taken initially.

150 g

120 g

90 g

100 g

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Explanation:

Initially, let x g of water and Acid was
taken. Initially 1st process
First test tube = (x - 20) g
Second test tube = (x + 20) g
2nd process
First test tube = (x - 20) + (x + 20)*(2/3)
Second test tube = (x + 20)*(1/3)
Now,
(x -20) + (2/3)(x +20) = 4*(1/3)(x + 20)
=> x = 100 g

Hence, option 4 is the correct answer.

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