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Solving an Equation

If 21 is subt...

Question

If 21 is subtracted from a certain number we get 81, then find the number?

102

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Solution

The correct option is A 102
$Let the unknown number be x . When 21 is subtracted from x, we get x - 21.$

$Since the difference is 81, x - 21 = 81$

$By adding 21 on both the sides, we get, x - 21 + 21 = 81 + 21 \Rightarrow x = 102$

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