in 10 years , a will be twice as old 5 as b was 10 years ago . if a is now 7 years older than b , the present age of b is
explanation : let b ' s age = x years . then , as age = ( x + 7 ) years . ( x + 7 + 10 ) = 2 ( x — 10 ) hence x = 37 . present age of b = 37 years answer : option b
add(multiply(const_2, 10), add(7, 10))