311 of the people in a bird park are girls.
38 of the remainder are boys and the rest are adults. There are 220 more adults than boys. How many people are there in the bird park altogether?
| Girls |
Boys |
Adults |
Total |
| 3 |
8 |
11 |
| |
3 |
5 |
|
| 3 u |
3 u |
5 u |
11 |
Fraction of the people that are boys and adults
= 1 -
311 =
811 Fraction of the remaining people that are adults
= 1 -
38 =
58 Total number of people = 11 u
Number of girls = 3 u
Number of boys = 3 u
Number of adults = 5 u
Number of more adults than boys
= 5 u - 3 u
= 2 u
2 u = 220
1 u = 220 ÷ 2 = 110
Total number of people
= 11 u
= 11 x 110
= 1210
Answer(s): 1210
