At a supermarket, the ratio of oranges to mangosteens was 9 : 10. After Shiyun bought four-fifths of the mangosteens, there was a total of 132 oranges and mangosteens left at the supermarket. How many fruits were there at first?
| |
Oranges |
Mangosteens |
Total |
Comparing oranges
and mangosteens at first |
9x1 =
9 u |
10x1 =
10 u |
19 u |
Before |
|
5x2 =
10 u |
|
Change |
|
- 4x2 =
- 8 u |
|
After |
9 u |
1x2 =
2 u |
132 |
The number of mangosteens at first is repeated. Make the number of mangosteens at first the same. LCM of 10 and 5 is 10.
Total number of fruits left
= 9 u + 2 u
= 11 u
11 u = 132
1 u = 132 ÷ 11 = 12
Number of fruits at first
= 9 u + 10 u
= 19 u
= 19 x 12
= 228
Answer(s): 228
