In a parade square,
17 of the pupils wore sweaters. After 46 pupils who wore sweaters entered the parade square, the percentage of pupils who wore sweaters increased to 80%. How many pupils in the parade square did not wear sweaters?
|
Wore sweaters |
Did not wear sweaters |
Before |
1x1 = 1 u |
6x1 = 6 u |
Change |
+ 46 |
|
After |
4x6 = 24 u |
1x6 = 6 u |
80% =
80100 =
45The number of pupils who did not wear sweaters remains unchanged. LCM of 6 and 1 is 6.
Number of pupils who wore sweaters and left
= 24 u - 1 u
= 23 u
23 u = 46
1 u = 46 ÷ 23 = 2
Number of pupils who did not wear sweaters
= 6 u
= 6 x 2
= 12
Answer(s): 12