In a container, there are some apples and mangosteens. If 120 more mangosteens are put into the container, the percentage of apples will decrease from 70% to 30%. How many apples are there in the container?
|
Apples |
Mangosteens |
Before |
7x3 = 21 u |
3x3 = 9 u |
Change |
No change |
+ 120 |
After |
3x7 = 21 u |
7x7 = 49 u |
70% =
70100 =
710 30% =
30100 =
310 The number of apples remains unchanged at first and in the end. Make the number of apples the same. LCM of 7 and 3 is 21.
Number of mangosteens added
= 49 u - 9 u
= 40 u
40 u = 120
1 u = 120 ÷ 40 = 3
Number of apples
= 21 u
= 21 x 3
= 63
Answer(s): 63