Student: John has 13 ten-dollar bills, 11 five-dollar bills, and 17 one-dollar bills. If John needs to pay exactly $128, what is the least number of bills he will need to use?\nOptions:\n(A) 14\n(B) 16\n(C) 17\n(D) 19\n(E) 20.
Another student: Let's say, hmmm...

User
Any combination of ten-dollar and five-dollar bills cannot add up to amount ending with 8. John has to use at least 3 one-dollar bills. To gather the rest, $125, John needs to use a minimum of 13 bills: 12 ten-dollar bills and 1 five-dollar bill. Final answer: (B).
Assistant