Question

delfin is willing to give a reward to who ever guesses his age this year ifits clues state that his age is divisible by 12 and is a multiple of 9 and he is less than 51 years old how old is delfin

Answer 1

36 years as he must have an age which is a multiple of lcm[12,9] which is 36.
Multiples of 36 below 51 is 36 itself.