Question

mario has less than $50. he has six bills in all. four of them are are tens. how many ones does he have????

Answer 1

M < 50
6 bills in all
4 of them are tens

40 + x + y

It is safe to say he has 1 one dollar bill, and up to 2 (he can have a 5 and a 1, which will equal 46, which is less than 50)

hope this helps