Zane has 13 notes. There are only fifty-dollar notes and one hundred-dollar notes. The total amount of money is $850. How many one hundred-dollar notes does Zane have?
Number of
one hundred-dollar notes |
Value of
one hundred-dollar notes |
Number of
fifty-dollar notes |
Value of
fifty-dollar notes |
Total
value |
| 13 |
13 x 100 = $1300 |
0 |
0 |
$1300 |
| 12 |
12 x 100 = $1200 |
1 |
1 x 50
= $50 |
$1250 |
| 4 |
4 x 100 =
$400 |
9 |
9 x 50 = $450 |
$850 |
Total amount of money if all the notes are one hundred-dollar notes
= 13 x 100
= $1300
Big difference between the amounts of one hundred-dollar notes and fifty-dollar notes
= 1300 - 850
= $450
Small difference between amount in one one hundred-dollar note and one fifty-dollar note
= 100 - 50
= 50
Number of fifty-dollar notes
= 450 ÷ 50
= 9
Number of one hundred-dollar notes
= 13 - 9
= 4
Answer(s): 4
