Jeremy has a carton containing some green kiwis and golden kiwis. If he adds in 25 green kiwis, 0.7 of the kiwis in the carton will be golden kiwis. If he adds in 70 golden kiwis,
67 of the kiwis in the carton will be green kiwis. How many kiwis are there in the carton?
|
Golden kiwis |
Green kiwis |
Golden kiwis |
Green kiwis |
Before |
7 u |
3 u - 25 |
6 p - 70 |
1 p |
Change |
|
+ 25 |
+ 70 |
|
After |
7 u |
3 u |
6 p |
1 p |
0.7 =
710 =
710If he adds 25 green kiwis,
Number of green kiwis in the end
= 10 u - 7 u
= 3 u
If he adds 70 golden kiwis,
Number of green kiwis in the end
= 7 p - 6 p
= 1 p
The number of each type in both scenarios remain unchanged at first.
7 u = 6 p - 70 --- (1)
3 u - 25 = 1 p
3 u = 1 p + 25 --- (2)
Make u the same.
(1)
x3 21 u = 18 p - 210 --- (3)
(2)
x7 21 u = 7 p + 175 --- (4)
(3) = (4)
18 p - 210 = 7 p + 175
18 p - 7 p = 210 + 175
11 p = 385
1 p = 385 ÷ 11 = 35
Number of kiwis at first
= 1 p + 6 p - 70
= 7 p - 70
= 7 x 35 - 70
= 245 - 70
= 175
Answer(s): 175