There were 245 mangosteens and chikoos in a fruit stall.
37 of the mangosteens and
35 of chikoos were sold. Given that there were 170 mangosteens and chikoos left, how many mangosteens were there in the fruit stall at first?
|
Mangosteens |
Chikoos |
Before |
7 u |
5 p |
Change |
- 3 u |
- 3 p |
After |
4 u |
2 p |
7 u + 5 p = 245 --- (1)
4 u + 2 p = 170 --- (2)
Make p the same.
(1)
x 2 14 u + 10 p = 490 --- (3)
(2)
x 5 20 u + 10 p = 850 --- (4)
(4) - (3)
20 u - 14 u = 850 - 490
6 u = 360
1 u = 360 ÷ 6 = 60
Number of mangosteens at first
= 7 u
= 7 x 60
= 420
Answer(s): 420