There were 304 pupils in a school. On the school anniversary,
34 of the girls and
45 of the boys came in silver jackets. The rest came in grey jackets. The number of boys who wore grey jackets was thrice of the girls who wore grey jackets. How many pupils were in silver jackets that day?
| Girls |
Boys |
Total |
| Silver jackets |
Grey jackets |
Silver jackets |
Grey jackets |
|
| 3 |
1 |
4x3 |
1x3 |
|
| |
1 |
|
3 |
|
| 3 u |
1 u |
12 u |
3 u |
19 u |
The number of boys who came in grey jackets is repeated. Make the number of boys who came in grey jackets the same. LCM of 1 and 3 is 3.
Total number of pupils
= 3 u + 1 u + 12 u + 3 u
= 19 u
19 u = 304
1 u = 304 ÷ 19 = 16
Number of pupils in silver jackets
= 3 u + 12 u
= 15 u
= 15 x 16
= 240
Answer(s): 240
