Dylan has 13 notes. There are only ten-dollar notes and twenty-dollar notes. The total amount of money is $200. How many twenty-dollar notes does Dylan have?
Number of
twenty-dollar notes |
Value of
twenty-dollar notes |
Number of
ten-dollar notes |
Value of
ten-dollar notes |
Total
value |
| 13 |
13 x 20 = $260 |
0 |
0 |
$260 |
| 12 |
12 x 20 = $240 |
1 |
1 x 10
= $10 |
$250 |
| 7 |
7 x 20 =
$140 |
6 |
6 x 10 = $60 |
$200 |
Total amount of money if all the notes are twenty-dollar notes
= 13 x 20
= $260
Big difference between the amounts of twenty-dollar notes and ten-dollar notes
= 260 - 200
= $60
Small difference between amount in one twenty-dollar note and one ten-dollar note
= 20 - 10
= 10
Number of ten-dollar notes
= 60 ÷ 10
= 6
Number of twenty-dollar notes
= 13 - 6
= 7
Answer(s): 7
