Question

divide 20 into two parts so that the sum of their reciprocals is 4/15

Answer 1

Ans- (c)Let the parts be x and 25 -x
∴ as [er tje question 
or 
Or 150 = 25x - x2
Or x2 – 25x + 150 = 0
Or x2 – 15x – 10x + 150 = 0
Or x(x - 15)- 10(x-15) = 0
Or (x - 15)(x – 10) = 0
Or x = 10, 15
So the parts of 25 are 10 and 15.