Question

13. If 35% of a number is 12 less than 50% of
that number, then the number is
(1) 80
(2) 60
(3) 50
(4) 40
(5) None of these​

Answer 1

Let the no. be x,
According to 1st condition,
35% of x= 35/100*x (eq.1)
According to 2nd condition,
50% of x-12= 50/100*x-12 (eq.2)
7x/20= x/2-12
Using transposition method,
2*7x=20(x-12)
14x=20x-240
14x-20x=-240
-6x=-240
x= -240/-6
x= 40
Therefore the correct option is (4) 40.
Hope it helps :)