In a box, there are some starfruits and passion fruits. If 100 more passion fruits are put into the box, the percentage of starfruits will decrease from 70% to 20%. How many starfruits are there in the box?
|
Starfruits |
Passion fruits |
Before |
7x1 = 7 u |
3x1 = 3 u |
Change |
No change |
+ 100 |
After |
1x7 = 7 u |
4x7 = 28 u |
70% =
70100 =
710 20% =
20100 =
15 The number of starfruits remains unchanged at first and in the end. Make the number of starfruits the same. LCM of 7 and 1 is 7.
Number of passion fruits added
= 28 u - 3 u
= 25 u
25 u = 100
1 u = 100 ÷ 25 = 4
Number of starfruits
= 7 u
= 7 x 4
= 28
Answer(s): 28