During a class party,
710 of the pupils were boys and the rest were girls. Halfway, 74 more girls joined in the party and there were
47 as many boys as girls. Find the number of pupils at the class party in the end.
|
Boys |
Girls |
Before |
7x4 = 28 u |
3x4 = 12 u |
|
|
+ 74 |
After |
4x7 = 28 u |
7x7 = 49 u |
The number of girls remains unchanged.
LCM of 4 and 7 = 28.
Number of more girls who joined in
= 49 u - 12 u
= 37 u
37 u = 74
1 u = 74 ÷ 37 = 2
Number of pupils in the end
= 28 u + 49 u
= 77 u
= 77 x 2
= 154
Answer(s): 154