In a parade square,
79 of the students wore ties. After 88 students who wore ties entered the parade square, the percentage of students who wore ties increased to 90%. How many students in the parade square did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
7x1 =
7 u |
2x1 =
2 u |
| Change |
+ 88 |
|
| After |
9x2 =
18 u |
1x2 =
2 u |
90% =
90100 =
910The number of students who did not wear ties remains unchanged. LCM of 2 and 1 is 2.
Number of students who wore ties and left
= 18 u - 7 u
= 11 u
11 u = 88
1 u = 88 ÷ 11 = 8
Number of students who did not wear ties
= 2 u
= 2 x 8
= 16
Answer(s): 16
