There was an equal number of mangosteens and persimmons. On Tuesday, some mangosteens were added, such that the number of mangosteens increased by 80%. On Wednesday, the number of mangosteens further increased by 50% and the number of persimmons decreased by 30%. There were 140 more mangosteens than persimmons in the end. How many mangosteens and persimmons were there altogether at first?
|
Mangosteens |
Persimmons |
Before |
1 u |
1 u |
Change 1 |
+ 0.8 u |
No change |
After 1 |
1.8 u |
1 u |
Change 2 |
+ 0.9 u |
- 0.3 u |
After 2 |
2.7 u |
0.7 u |
Number of mangosteens added on Tuesday
= 80% x 1 u
=
80100 x 1 u
= 0.8 u
Number of mangosteens increased on Wednesday
= 50% x 1.8 u
=
50100 x 1.8 u
= 0.9 u
Number of persimmons decreased on Wednesday
= 30% x 1 u
=
30100 x 1 u
= 0.3 u
Number of more mangosteens than persimmons in the end
= 2.7 u - 0.7 u
= 2 u
2 u = 140
1 u = 140 ÷ 2 = 70
Total number of mangosteens and persimmons at first
= 1 u + 1 u
= 2 u
= 2 x 70
= 140
Answer(s): 140