There were some passion fruits at a supermarket. In the morning,
14 of passion fruits were sold. In the afternoon, another 30 passion fruits were sold. The total number of passion fruits sold was 9 less than
57 of the number of passion fruits the supermarket had at first.
- How many passion fruits were there at first?
- What fraction of the passion fruits in the supermarket remained unsold in the afternoon?
|
Comparison 1 |
Comparison 2 |
Before |
4x7 = 28 u |
7x4 = 28 u |
Change 1 |
- 1x7 = - 7 u |
|
After 1 |
3x7 = 21 u |
Change 2 |
- 30 |
After 2 |
21 u - 30 |
5x4 - 9 = 20 u - 9 |
(a)
The number of passion fruits at first is repeated in both comparisons. Make the number of passion fruits at first. LCM of 4 and 7 is 28.
The number of passion fruits in the end is the same in both comparisons.
21 u - 30 = 20 u - 9
21 u - 20 u = 30 - 9
13 u = 39
1 u = 39 ÷ 13 = 3
Number of passion fruits at first
= 28 u
= 28 x 3
= 84
(b)
Number of passion fruits that remained unsold
= 8 u + 9
= 8 x 3 + 9
= 33
Fraction of passion fruits that remained unsold
=
3384=
1128Answer(s): (a) 84; (b)
1128