If a building has 20 stairs above ground level and 20 stairs below ground level, then which of the following represents 16^th stair below ground level? [1 Mark]

(A) You are at +16^th step.
(B) You are at -16^th step.
(C) You are at -4^th step.
(D) You are at +4^th step.

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Solution

When we compare the stairs to a vertical number line, the ground level can be taken as zero, the stairs above the ground level are considered as positive integers and the stairs below the ground level are considered as negative integers.

So, if you are standing at the 16^th step below ground level, then we can say that you are at -16^th step. [1 Mark]

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If a building has 20 stairs above ground level and 20 stairs below ground level, then which of the following represents 16th stair below ground level? [1 Mark] (A) You are at +16th step. (B) You are at -16th step. (C) You are at -4th step. (D) You are at +4th step.

If a building has 20 stairs above ground level and 20 stairs below ground level, then which of the following represents 16^th stair below ground level? [1 Mark]

(A) You are at +16^th step.
(B) You are at -16^th step.
(C) You are at -4^th step.
(D) You are at +4^th step.