There were some adults and children at a gathering.
38 of the people were adults.
310 of the children were boys and the rest were girls. There were 21 girls.
- How many children were there?
- How many more children than adults were at the gathering?
Adults |
Children |
Total |
3x2 |
5x2 |
8x2 |
|
Boys |
Girls |
|
|
3x1 |
7x1 |
|
6 u |
3 u |
7 u |
16 u |
(a)
The number of children is the combined repeated identity.
Number of girls = 7 u
7 u = 21
1 u = 21 ÷ 7 = 3
Number of children
= 10 u
= 10 x 3
= 30
(b)
Number of more children than adults
= 10 u - 6 u
= 4 u
= 4 x 3
= 12
Answer(s): (a) 30; (b) 12