During a class parade,
47 of the pupils were girls and the rest were boys. Halfway, 361 more boys joined in the parade and there were
37 as many girls as boys. Find the number of pupils at the class parade in the end.
|
Girls |
Boys |
Before |
4x3 = 12 u |
3x3 = 9 u |
|
|
+ 361 |
After |
3x4 = 12 u |
7x4 = 28 u |
The number of boys remains unchanged.
LCM of 3 and 4 = 12.
Number of more boys who joined in
= 28 u - 9 u
= 19 u
19 u = 361
1 u = 361 ÷ 19 = 19
Number of pupils in the end
= 12 u + 28 u
= 40 u
= 40 x 19
= 760
Answer(s): 760