Nicole had some $1-notes and some $5-notes.
89 of the-notes were $1-notes and the rest were $5-notes. After Nicole had spent $1150 worth of $5-notes and
58 of $1-notes, she had
18 of the notes left. Find the number of $1-notes Nicole had left.
| |
$1-notes |
$5-notes |
Total |
Comparing $1-notes
and $5-notes
at first |
8x8 =
64 u |
1x8 =
8 u |
9x8 =
72 u |
| Before |
8x8 =
64 u |
|
8x9 =
72 u |
| Change |
- 5x8 =
- 40 u |
- 230 |
- 7x9 =
- 63 u |
| After |
3x8=
24 u |
8 u - 230 |
1x9 =
9 u |
The total number of notes at first is the repeated. Make the total number of notes the same. LCM of 9 and 8 is 72.
The number of $1-notes is repeated.
Number of $5-notes
= 1150 ÷ 5
= 230
Total number of notes spent = 40 u + 230
40 u + 230 = 63 u
63 u - 40 u = 230
23 u = 230
1 u = 230 ÷ 23 = 10
Number of $1-notes that Nicole had left
= 24 u
= 24 x 10
= 240
Answer(s): 240
