There were 309 starfruits and mangoes in a fruit stall.
37 of the starfruits and
35 of mangoes were sold. Given that there were 132 starfruits and mangoes left, how many starfruits were there in the fruit stall at first?
| |
Starfruits |
Mangoes |
| Before |
7 u |
5 p |
| Change |
- 3 u |
- 3 p |
| After |
4 u |
2 p |
7 u + 5 p = 309 --- (1)
4 u + 2 p = 132 --- (2)
Make p the same.
(1)
x 2 14 u + 10 p = 618 --- (3)
(2)
x 5 20 u + 10 p = 660 --- (4)
(4) - (3)
20 u - 14 u = 660 - 618
6 u = 42
1 u = 42 ÷ 6 = 7
Number of starfruits at first
= 7 u
= 7 x 7
= 49
Answer(s): 49
