NandishSS wrote:

The figure above represents a system of roads along which traffic flows in the direction indicated by the arrows. If the traffic were to split evenly at each fork of

the road system, what percent of the traffic entering fork C would exit at Y?

A. 87.5%

B. 75%

C. 62.5%

D. 50%

E. 12.5%

How to solve this question?

Roads divide into two after leaving from Z.

50 % move downwards and 50% move upwards

If we notice all vehicles moving downwards will end up taking exit Y.

The upward moving vehicles divide at first junction in 25% (moving upwards ) and 25 % (moving downwards). Again if we notice all vehicles moving downwards will end up taking exit Y.

Vehicles moving upwards from this point again divide, leading to 12.5% moving upwards and 12.5% moving downwards, and these will take exit Y.

Total vehicles taking exit Y= 50% +25% +12.5%= 87.5%

A is the answer

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