In a basketball court,
25 of the children wore ties. After 275 children who wore ties entered the basketball court, the percentage of children who wore ties increased to 90%. How many children in the basketball court did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
2x1 =
2 u |
3x1 =
3 u |
| Change |
+ 275 |
|
| After |
9x3 =
27 u |
1x3 =
3 u |
90% =
90100 =
910The number of children who did not wear ties remains unchanged. LCM of 3 and 1 is 3.
Number of children who wore ties and left
= 27 u - 2 u
= 25 u
25 u = 275
1 u = 275 ÷ 25 = 11
Number of children who did not wear ties
= 3 u
= 3 x 11
= 33
Answer(s): 33
