Question 21
How many ways are there to buy a 75-dollar toy using 5-, 10- or 50-dollar notes? Pay exactly 75 dollars with no change. A way is determined by the number of notes of each value; order does not matter.
Answer format: enter one whole number without units. Leading zeros are optional; the source paper answer sheet uses four digits.
Answer format: enter one whole number without units. Leading zeros are optional; the source paper answer sheet uses four digits.