There were 96 mangosteens and oranges in a stall at first. After
15 of the mangosteens and
12 of the oranges were sold, there were a total of 66 mangosteens and oranges now. How many mangosteens were there at first?
|
Mangosteens |
Oranges |
Total |
Before |
5 u |
2 p |
96 |
Change |
- 1 u |
- 1 p |
- 30 |
After |
4 u |
1 p |
66 |
Total number of mangosteens and oranges sold
= 96 - 66
= 30
4 u + 1 p = 66
1 p = 66 - 4 u --- (1)
1 u + 1 p = 30
1 p = 30 - 1 u --- (2)
(2) = (1)
30 - 1 u = 66 - 4 u
4 u - 1 u = 66 - 30
3 u = 36
1 u = 36 ÷ 3 = 12
Number of mangosteens at first
= 5 u
= 5 x 12
= 60
Answer(s): 60