A total of 203 adults and children went to a concert hall. There were 21 more children than adults at the concert hall. Given that the number of girls was 3 times the number of boys at the concert hall, how many girls were at the concert hall?
Adults |
Children |
Total |
4 u - 21 |
4 u |
203 |
|
Girls |
Boys |
|
|
3 u |
1 u |
|
Number of boys = 1 u
Number of girls = 3 u
Number of children = 1 u + 3 u = 4 u
Number of adults = 4 u - 21
Total number of people
= 4 u + 4 u - 21
= 8 u - 21
8 u - 21 = 203
8 u = 203 + 21
8 u = 224
1 u = 224 ÷ 8 = 28
Number of girls
= 3 u
= 3 x 28
= 84
Answer(s): 84