Question

14--Twelve years ago, Budh was 1 point
twice as old as Badri. If the ratio
of their present ages is 4:3
respectively, find the difference
between their present ages.​

Answer 1

Explanation:

1/2rootx+1/2rooty.dy/dx=0

=》1/2rooty. dy/dx= -1/2rootx

=》dy/dx= rooty/rootx