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There are 35 street lamps in a row on a national highway. all are lit except one. The faulty lamp is 15th from the right end. What is the position of
Question

There are 35 street lamps in a row on a national highway. all are lit except one. The faulty lamp is 15th from the right end. What is the position of the family lamp from the left end?

A.

22nd

B.

20th

C.

21st

D.

23rd

Correct option is C

Given: 

Total lamps= 35

Position of faulty lamp from right= 15

Formula used:

Total lamp = Position of faulty lamp from right + Position of faulty from left -1

35 = 15 + L -1 

35 = 14 + L

L = 21

Hence, position of faulty lamp from left is 21.

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