A total of 360 adults and children went to a concert hall. There were 40 more children than adults at the concert hall. Given that the number of boys was 3 times the number of girls at the concert hall, how many boys were at the concert hall?
| Adults |
Children |
Total |
| 4 u - 40 |
4 u |
360 |
| |
Boys |
Girls |
|
| |
3 u |
1 u |
|
Number of girls = 1 u
Number of boys = 3 u
Number of children = 1 u + 3 u = 4 u
Number of adults = 4 u - 40
Total number of people
= 4 u + 4 u - 40
= 8 u - 40
8 u - 40 = 360
8 u = 360 + 40
8 u = 400
1 u = 400 ÷ 8 = 50
Number of boys
= 3 u
= 3 x 50
= 150
Answer(s): 150
