In a basketball court,
17 of the children wore sweaters. After 78 children who wore sweaters entered the basketball court, the percentage of children who wore sweaters increased to 70%. How many children in the basketball court did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
1x1 =
1 u |
6x1 =
6 u |
| Change |
+ 78 |
|
| After |
7x2 =
14 u |
3x2 =
6 u |
70% =
70100 =
710The number of children who did not wear sweaters remains unchanged. LCM of 6 and 3 is 6.
Number of children who wore sweaters and left
= 14 u - 1 u
= 13 u
13 u = 78
1 u = 78 ÷ 13 = 6
Number of children who did not wear sweaters
= 6 u
= 6 x 6
= 36
Answer(s): 36
