There were 312 students in a school. On the school anniversary,
23 of the girls and
45 of the boys came in red vests. The rest came in gold vests. The number of boys who wore gold vests was twice of the girls who wore gold vests. How many students were in red vests that day?
| Girls |
Boys |
Total |
| Red vests |
Gold vests |
Red vests |
Gold vests |
|
| 2 |
1 |
4x2 |
1x2 |
|
| |
1 |
|
2 |
|
| 2 u |
1 u |
8 u |
2 u |
13 u |
The number of boys who came in gold vests is repeated. Make the number of boys who came in gold vests the same. LCM of 1 and 2 is 2.
Total number of students
= 2 u + 1 u + 8 u + 2 u
= 13 u
13 u = 312
1 u = 312 ÷ 13 = 24
Number of students in red vests
= 2 u + 8 u
= 10 u
= 10 x 24
= 240
Answer(s): 240
