Question
If 20% of a number is added to 120, then the result is
the same number. 80% of the same number is:Solution
Let the number be x 20% of x = 0.2x ATQ: 0.2x + 120 = x x − 0.2x = 120 0.8x = 120 x = 120 / 0.8 = 150 80% of x = 0.8 × 150 = 120
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