Discussion of Question with ID = 030 under Basic-Simplification

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Question

Out of a collection of only blue and pink marbles, 2 pink marbles are removed away. After that there are 2 blue marbles for every pink marble. Next, 36 blue marbles are removed away. As a result, there are 5 pink marbles for every blue marble. How many blue marbles are there at present?

A

4 marbles.

B

6 marbles.

C

10 marbles.

D

8 marbles.

Soln.
Ans: a

Let the number of blue marbles at present be x. The number of pink marbles at present are 5x. If we put back 36 blue marbles, the equation becomes x + 36 = 2 × 5x, which gives 9x = 36, or x = 4 marbles. Note: some information in the question is never used, it is given for confusing the candidate.