There were 221 students in a school. On the school anniversary,
34 of the girls and
23 of the boys came in red blazers. The rest came in black blazers. The number of boys who wore black blazers was thrice of the girls who wore black blazers. How many students were in red blazers that day?
| Girls |
Boys |
Total |
| Red blazers |
Black blazers |
Red blazers |
Black blazers |
|
| 3 |
1 |
2x3 |
1x3 |
|
| |
1 |
|
3 |
|
| 3 u |
1 u |
6 u |
3 u |
13 u |
The number of boys who came in black blazers is repeated. Make the number of boys who came in black blazers the same. LCM of 1 and 3 is 3.
Total number of students
= 3 u + 1 u + 6 u + 3 u
= 13 u
13 u = 221
1 u = 221 ÷ 13 = 17
Number of students in red blazers
= 3 u + 6 u
= 9 u
= 9 x 17
= 153
Answer(s): 153
