During a class parade,
910 of the pupils were boys and the rest were girls. Halfway, 770 more girls joined in the parade and there were
49 as many boys as girls. Find the number of pupils at the class parade in the end.
|
Boys |
Girls |
Before |
9x4 = 36 u |
1x4 = 4 u |
|
|
+ 770 |
After |
4x9 = 36 u |
9x9 = 81 u |
The number of girls remains unchanged.
LCM of 4 and 9 = 36.
Number of more girls who joined in
= 81 u - 4 u
= 77 u
77 u = 770
1 u = 770 ÷ 77 = 10
Number of pupils in the end
= 36 u + 81 u
= 117 u
= 117 x 10
= 1170
Answer(s): 1170