15 of the people in a concert hall are boys.
14 of the remainder are girls and the rest are adults. There are 480 more adults than girls. How many people are there in the concert hall altogether?
| Boys |
Girls |
Adults |
Total |
| 1 |
4 |
5 |
| |
1 |
3 |
|
| 1 u |
1 u |
3 u |
5 |
Fraction of the people that are girls and adults
= 1 -
15 =
45 Fraction of the remaining people that are adults
= 1 -
14 =
34 Total number of people = 5 u
Number of boys = 1 u
Number of girls = 1 u
Number of adults = 3 u
Number of more adults than girls
= 3 u - 1 u
= 2 u
2 u = 480
1 u = 480 ÷ 2 = 240
Total number of people
= 5 u
= 5 x 240
= 1200
Answer(s): 1200
