Mary spent $37 at a shop. She took out some ten-dollar notes and five-dollar notes from her wallet to pay for the items at the cashier. She received $3 change from the cashier.
- How much money did Mary take out from her wallet?
- How many possible number of ten-dollar notes and five-dollar notes did she take out from her wallet?
(a)
Amount that Mary took out from her wallet
= 37 + 3
= $40
(b)
Possible number of ten-dollar notes and five-dollar notes :
10, 10, 10, 5, 5
10, 10, 5, 5, 5, 5
10, 5, 5, 5, 5, 5, 5
10, 5, 5, 5, 5, 5, 5
Number of possible number of ten-dollar notes and five-dollar notes: 4
Answer(s): (a) $40; (b) 4