Joelle had some $100-notes and some $2-notes.
58 of the-notes were $100-notes and the rest were $2-notes. After Joelle had spent $88 worth of $2-notes and
45 of $100-notes, she had
25 of the notes left. Find the number of $100-notes Joelle had left.
| |
$100-notes |
$2-notes |
Total |
Comparing $100-notes
and $2-notes
at first |
5x5 =
25 u |
3x5 =
15 u |
8x5 =
40 u |
| Before |
5x5 =
25 u |
|
5x8 =
40 u |
| Change |
- 4x5 =
- 20 u |
- 44 |
- 3x8 =
- 24 u |
| After |
1x5=
5 u |
15 u - 44 |
2x8 =
16 u |
The total number of notes at first is the repeated. Make the total number of notes the same. LCM of 8 and 5 is 40.
The number of $100-notes is repeated.
Number of $2-notes
= 88 ÷ 2
= 44
Total number of notes spent = 20 u + 44
20 u + 44 = 24 u
24 u - 20 u = 44
4 u = 44
1 u = 44 ÷ 4 = 11
Number of $100-notes that Joelle had left
= 5 u
= 5 x 11
= 55
Answer(s): 55
