Two points A & B are marked on the number line as shown in the figure. B = 7 and the distance between them is 20 units. Point A is

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-20

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-13

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Solution

The correct option is D
-13

If we plot these points on the number line

Here A lies on the left side of 7.

$\Rightarrow$ A is 20 units less than 7

Now 7 - (A) = 20

$\Rightarrow - A = 20 - 7 = 13$

$\Rightarrow A = - 13$

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