At the funfair, there were 75% as many girls as boys and 30% more adults than girls. Given that there were 81 more adults than girls at the funfair, how many children were there altogether?
| Girls |
Boys |
Adults |
| 3x10 |
4x10 |
|
| 10x3 |
|
13x3 |
| 30 u |
40 u |
39 u |
75% =
75100 =
34Girls : Boys = 3 : 4
100% + 30% = 130%
130% =
130100 =
1310 Girls : Adults = 10 : 13
The number of girls is repeated. Make the number of girls the same. LCM of 3 and 10 is 30.
Number of more adults than girls
= 39 u - 30 u
= 9 u
9 u = 81
1 u = 81 ÷ 9 = 9
Number of children
= 30 u + 40 u
= 70 u
= 70 x 9
= 630
Answer(s): 630
