There were some adults and children at a celebration.
37 of the people were adults.
23 of the children were girls and the rest were boys. There were 20 boys.
- How many children were there?
- How many more children than adults were at the celebration?
Adults |
Children |
Total |
3x3 |
4x3 |
7x3 |
|
Girls |
Boys |
|
|
2x4 |
1x4 |
|
9 u |
8 u |
4 u |
21 u |
(a)
The number of children is the combined repeated identity.
Number of boys = 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Number of children
= 12 u
= 12 x 5
= 60
(b)
Number of more children than adults
= 12 u - 9 u
= 3 u
= 3 x 5
= 15
Answer(s): (a) 60; (b) 15