Q16 of 62 Page 123

A number decreased byof itself by 87. The number is

Let the number = Z


∴ Z - (of Z) = 87


⇒ Z - (Z × 55/2 × 1/100) = 87


⇒ Z - (Z × 11/2 × 1/20) = 87


⇒ Z- (11Z/40) = 87


⇒ 29Z/40 = 87


⇒ 29Z/40 = 87


⇒ Z = 87 × 40/29


⇒ Z = 120

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