There were 378 pupils in a school. On the school anniversary,
45 of the boys and
34 of the girls came in brown jackets. The rest came in blue jackets. The number of girls who wore blue jackets was four times of the boys who wore blue jackets. How many pupils were in brown jackets that day?
Boys |
Girls |
Total |
Brown jackets |
Blue jackets |
Brown jackets |
Blue jackets |
|
4 |
1 |
3x4 |
1x4 |
|
|
1 |
|
4 |
|
4 u |
1 u |
12 u |
4 u |
21 u |
The number of girls who came in blue jackets is repeated. Make the number of girls who came in blue jackets the same. LCM of 1 and 4 is 4.
Total number of pupils
= 4 u + 1 u + 12 u + 4 u
= 21 u
21 u = 378
1 u = 378 ÷ 21 = 18
Number of pupils in brown jackets
= 4 u + 12 u
= 16 u
= 16 x 18
= 288
Answer(s): 288