Problem: in 10 years , a will be twice as old 5 as b was 10 years ago . if a is now 5 years older than b , the present age of b is
Rationale: "explanation : let b ' s age = x years . then , as age = ( x + 5 ) years . ( x + 5 + 10 ) = 2 ( x — 10 ) hence x = 35 . present age of b = 35 years answer : option a"
annotated_formula: add(multiply(const_2, 10), add(5, 10))