In a basketball court,
16 of the girls wore sweaters. After 38 girls who wore sweaters entered the basketball court, the percentage of girls who wore sweaters increased to 80%. How many girls in the basketball court did not wear sweaters?
| |
Wore sweaters |
Did not wear sweaters |
| Before |
1x1 =
1 u |
5x1 =
5 u |
| Change |
+ 38 |
|
| After |
4x5 =
20 u |
1x5 =
5 u |
80% =
80100 =
45The number of girls who did not wear sweaters remains unchanged. LCM of 5 and 1 is 5.
Number of girls who wore sweaters and left
= 20 u - 1 u
= 19 u
19 u = 38
1 u = 38 ÷ 19 = 2
Number of girls who did not wear sweaters
= 5 u
= 5 x 2
= 10
Answer(s): 10
