Question

A number when 25 subtracted from it reduces to its 80%. what is 40% of that number

Answer 1

the answer is 50

first let the number be equal to x

x-25=80/100x

x-25-4/5x=0

5x-125=4x

x-125=0

x=125

the required answer will be 125 times 40%

125*40/100

=50

hence, the answer is 50

Answer 2

let the no. be x
according to the condition the eq. will be
x-25/x *100=80
x-25/x=4/5
5x-125=4x
125=x
the 40% of the no. will be
125*40/100
50
the 40%of the no. will be 50.