a father is 4 times as old as his son . in 20 years , he ' ll be twice as old . how old are they now ?
Pick.
A) 540
B) 1040
C) 2040
D) 1030
E) 15,30

Rationale: if f is age of father and s is age of son f = 4 s f + 20 = 2 * ( s + 20 ) 4 s + 20 = 2 s + 40 2 s = 20 s = 10 f = 40 answer : b
Answer: B