During a class celebration,
47 of the pupils were girls and the rest were boys. Halfway, 115 more boys joined in the celebration and there were
38 as many girls as boys. Find the number of pupils at the class celebration in the end.
|
Girls |
Boys |
Before |
4x3 = 12 u |
3x3 = 9 u |
|
|
+ 115 |
After |
3x4 = 12 u |
8x4 = 32 u |
The number of boys remains unchanged.
LCM of 3 and 4 = 12.
Number of more boys who joined in
= 32 u - 9 u
= 23 u
23 u = 115
1 u = 115 ÷ 23 = 5
Number of pupils in the end
= 12 u + 32 u
= 44 u
= 44 x 5
= 220
Answer(s): 220