A number decreased by
of 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
16
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