There were 760 pupils in a school. On the school anniversary,
23 of the boys and
34 of the girls came in grey blazers. The rest came in black blazers. The number of girls who wore black blazers was four times of the boys who wore black blazers. How many pupils were in grey blazers that day?
| Boys |
Girls |
Total |
| Grey blazers |
Black blazers |
Grey blazers |
Black blazers |
|
| 2 |
1 |
3x4 |
1x4 |
|
| |
1 |
|
4 |
|
| 2 u |
1 u |
12 u |
4 u |
19 u |
The number of girls who came in black blazers is repeated. Make the number of girls who came in black blazers the same. LCM of 1 and 4 is 4.
Total number of pupils
= 2 u + 1 u + 12 u + 4 u
= 19 u
19 u = 760
1 u = 760 ÷ 19 = 40
Number of pupils in grey blazers
= 2 u + 12 u
= 14 u
= 14 x 40
= 560
Answer(s): 560
