Question

Roy is thrice as old as son at present after 12 years he will be 24 years older than his son

Answer 1

R=3×S,

(R+12)=(S+12)+24,

R+12=S+36,

R-S=24,

3×S-S=24,

2×S=24,

S=12 yrs,

Roy's age=3×12=36 yrs