Respuesta :
i think the answer is 3 he will 3 days left before he can wash.
what you bed to do is find the least common multiple of each number:
6, 12, 18, 24, 30, 36
9, 18, 27, 36
the least common multiple is 18 so every 18 days they will do laundry together
6, 12, 18, 24, 30, 36
9, 18, 27, 36
the least common multiple is 18 so every 18 days they will do laundry together