There were 54 mangosteens and starfruits in a stall at first. After
14 of the mangosteens and
12 of the starfruits were sold, there were a total of 36 mangosteens and starfruits now. How many mangosteens are there now?
|
Mangosteens |
Starfruits |
Total |
Before |
4 u |
2 p |
54 |
Change |
- 1 u |
- 1 p |
- 18 |
After |
3 u |
1 p |
36 |
Total number of mangosteens and starfruits sold
= 54 - 36
= 18
3 u + 1 p = 36
1 p = 36 - 3 u --- (1)
1 u + 1 p = 18
1 p = 18 - 1 u --- (2)
(2) = (1)
18 - 1 u = 36 - 3 u
3 u - 1 u = 36 - 18
2 u = 18
1 u = 18 ÷ 2 = 9
Number of mangosteens now
= 3 u
= 3 x 9
= 27
Answer(s): 27