There were 418 pupils in a school. On the school anniversary,
45 of the girls and
23 of the boys came in red jackets. The rest came in blue jackets. The number of boys who wore blue jackets was twice of the girls who wore blue jackets. How many pupils were in red jackets that day?
| Girls |
Boys |
Total |
| Red jackets |
Blue jackets |
Red jackets |
Blue jackets |
|
| 4 |
1 |
2x2 |
1x2 |
|
| |
1 |
|
2 |
|
| 4 u |
1 u |
4 u |
2 u |
11 u |
The number of boys who came in blue jackets is repeated. Make the number of boys who came in blue jackets the same. LCM of 1 and 2 is 2.
Total number of pupils
= 4 u + 1 u + 4 u + 2 u
= 11 u
11 u = 418
1 u = 418 ÷ 11 = 38
Number of pupils in red jackets
= 4 u + 4 u
= 8 u
= 8 x 38
= 304
Answer(s): 304
