During a class conference,
58 of the pupils were girls and the rest were boys. Halfway, 256 more boys joined in the conference and there were
35 as many girls as boys. Find the number of pupils at the class conference in the end.
|
Girls |
Boys |
Before |
5x3 = 15 u |
3x3 = 9 u |
|
|
+ 256 |
After |
3x5 = 15 u |
5x5 = 25 u |
The number of boys remains unchanged.
LCM of 3 and 5 = 15.
Number of more boys who joined in
= 25 u - 9 u
= 16 u
16 u = 256
1 u = 256 ÷ 16 = 16
Number of pupils in the end
= 15 u + 25 u
= 40 u
= 40 x 16
= 640
Answer(s): 640