At a shop, the ratio of grapefruits to dragon fruits was 3 : 10. After Roshel bought two-fifths of the dragon fruits, there was a total of 90 grapefruits and dragon fruits left at the shop. How many fruits were there at first?
| |
Grapefruits |
Dragon Fruits |
Total |
Comparing grapefruits
and dragon fruits at first |
3x1 =
3 u |
10x1 =
10 u |
13 u |
Before |
|
5x2 =
10 u |
|
Change |
|
- 2x2 =
- 4 u |
|
After |
3 u |
3x2 =
6 u |
90 |
The number of dragon fruits at first is repeated. Make the number of dragon fruits at first the same. LCM of 10 and 5 is 10.
Total number of fruits left
= 3 u + 6 u
= 9 u
9 u = 90
1 u = 90 ÷ 9 = 10
Number of fruits at first
= 3 u + 10 u
= 13 u
= 13 x 10
= 130
Answer(s): 130
