During a class celebration,
910 of the pupils were boys and the rest were girls. Halfway, 731 more girls joined in the celebration and there were
25 as many boys as girls. Find the number of pupils at the class celebration in the end.
|
Boys |
Girls |
Before |
9x2 = 18 u |
1x2 = 2 u |
|
|
+ 731 |
After |
2x9 = 18 u |
5x9 = 45 u |
The number of girls remains unchanged.
LCM of 2 and 9 = 18.
Number of more girls who joined in
= 45 u - 2 u
= 43 u
43 u = 731
1 u = 731 ÷ 43 = 17
Number of pupils in the end
= 18 u + 45 u
= 63 u
= 63 x 17
= 1071
Answer(s): 1071