There were 48 mangosteens and chikoos in a stall at first. After
17 of the mangosteens and
12 of the chikoos were sold, there were a total of 39 mangosteens and chikoos now. How many mangosteens were there at first?
| |
Mangosteens |
Chikoos |
Total |
| Before |
7 u |
2 p |
48 |
| Change |
- 1 u |
- 1 p |
- 9 |
| After |
6 u |
1 p |
39 |
Total number of mangosteens and chikoos sold
= 48 - 39
= 9
6 u + 1 p = 39
1 p = 39 - 6 u --- (1)
1 u + 1 p = 9
1 p = 9 - 1 u --- (2)
(2) = (1)
9 - 1 u = 39 - 6 u
6 u - 1 u = 39 - 9
5 u = 30
1 u = 30 ÷ 5 = 6
Number of mangosteens at first
= 7 u
= 7 x 6
= 42
Answer(s): 42
