In a box, there are some apples and persimmons. If 45 more persimmons are put into the box, the percentage of apples will decrease from 80% to 20%. How many apples are there in the box?
|
Apples |
Persimmons |
Before |
4x1 = 4 u |
1x1 = 1 u |
Change |
No change |
+ 45 |
After |
1x4 = 4 u |
4x4 = 16 u |
80% =
80100 =
45 20% =
20100 =
15 The number of apples remains unchanged at first and in the end. Make the number of apples the same. LCM of 4 and 1 is 4.
Number of persimmons added
= 16 u - 1 u
= 15 u
15 u = 45
1 u = 45 ÷ 15 = 3
Number of apples
= 4 u
= 4 x 3
= 12
Answer(s): 12