There were 109 starfruits and passion fruits in a stall at first. After
17 of the starfruits and
12 of the passion fruits were sold, there were a total of 87 starfruits and passion fruits now. How many starfruits were there at first?
| |
Starfruits |
Passion Fruits |
Total |
| Before |
7 u |
2 p |
109 |
| Change |
- 1 u |
- 1 p |
- 22 |
| After |
6 u |
1 p |
87 |
Total number of starfruits and passion fruits sold
= 109 - 87
= 22
6 u + 1 p = 87
1 p = 87 - 6 u --- (1)
1 u + 1 p = 22
1 p = 22 - 1 u --- (2)
(2) = (1)
22 - 1 u = 87 - 6 u
6 u - 1 u = 87 - 22
5 u = 65
1 u = 65 ÷ 5 = 13
Number of starfruits at first
= 7 u
= 7 x 13
= 91
Answer(s): 91
