In a parade square,
710 of the boys wore ties. After 16 boys who wore ties left the parade square, the percentage of boys who wore ties decreased to 50%. How many boys in the parade square did not wear ties?
| |
Wore ties |
Did not wear ties |
| Before |
7x1 =
7 u |
3x1 =
3 u |
| Change |
- 16 |
|
| After |
1x3 =
3 u |
1x3 =
3 u |
50% =
50100 =
12The number of boys who did not wear ties remains unchanged. LCM of 3 and 1 is 3.
Number of boys who wore ties and left
= 7 u - 3 u
= 4 u
4 u = 16
1 u = 16 ÷ 4 = 4
Number of boys who did not wear ties
= 3 u
= 3 x 4
= 12
Answer(s): 12
