In a box, there are some pears and mangosteens. If 20 more mangosteens are put into the box, the percentage of pears will decrease from 80% to 40%. How many pears are there in the box?
|
Pears |
Mangosteens |
Before |
4x1 = 4 u |
1x1 = 1 u |
Change |
No change |
+ 20 |
After |
2x2 = 4 u |
3x2 = 6 u |
80% =
80100 =
45 40% =
40100 =
25 The number of pears remains unchanged at first and in the end. Make the number of pears the same. LCM of 4 and 2 is 4.
Number of mangosteens added
= 6 u - 1 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of pears
= 4 u
= 4 x 4
= 16
Answer(s): 16