In a box, there are some mangosteens and starfruits. If 150 more starfruits are put into the box, the percentage of mangosteens will decrease from 70% to 20%. How many mangosteens are there in the box?
|
Mangosteens |
Starfruits |
Before |
7x1 = 7 u |
3x1 = 3 u |
Change |
No change |
+ 150 |
After |
1x7 = 7 u |
4x7 = 28 u |
70% =
70100 =
710 20% =
20100 =
15 The number of mangosteens remains unchanged at first and in the end. Make the number of mangosteens the same. LCM of 7 and 1 is 7.
Number of starfruits added
= 28 u - 3 u
= 25 u
25 u = 150
1 u = 150 ÷ 25 = 6
Number of mangosteens
= 7 u
= 7 x 6
= 42
Answer(s): 42