Q15 of 62 Page 123

A number exceeds 20% of itself by 40. The number is

Let the number = Z

∴ 20% of Z + 40 = Z

⇒ (Z × 20/100) + 40 = Z

⇒ Z/5 + 40 = Z

⇒ Z – Z/5 = 40

⇒ 4Z/5 = 40

⇒ Z = 40 × 5/4

⇒ Z = 50

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