There were 76 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 50 mangosteens and oranges now. How many mangosteens were there at first?
| |
Mangosteens |
Oranges |
Total |
| Before |
5 u |
2 p |
76 |
| Change |
- 1 u |
- 1 p |
- 26 |
| After |
4 u |
1 p |
50 |
Total number of mangosteens and oranges sold
= 76 - 50
= 26
4 u + 1 p = 50
1 p = 50 - 4 u --- (1)
1 u + 1 p = 26
1 p = 26 - 1 u --- (2)
(2) = (1)
26 - 1 u = 50 - 4 u
4 u - 1 u = 50 - 26
3 u = 24
1 u = 24 ÷ 3 = 8
Number of mangosteens at first
= 5 u
= 5 x 8
= 40
Answer(s): 40
