PSLE Jade had a basket of yellow balls and pink balls in the ratio 16 : 9. She removed an equal number of yellow balls and pink balls from the basket. The ratio of the number of yellow balls and pink balls left in the basket became 9 : 2. What percentage of the balls were left in the basket?
|
Yellow balls |
Pink balls |
Difference |
Total |
Before |
16x1 = 16 u |
9x1 = 9 u |
7x1 = 7 u |
25x1 = 25 u |
Change |
- 7 u |
- 7 u |
|
|
After |
9x1 = 9 u |
2x1 = 2 u |
7x1 = 7 u |
11x1 = 11 u |
When Jade removed an equal number of yellow balls and pink balls, the difference between the number of yellow balls and pink balls at first and in the end remains the same.
LCM of 7 and 7 is 7.
Percentage of the balls left in the basket
=
1125 x 100%
= 1125 x 100%
= 44%
Answer: 44%