There were some adults and children at a party.
49 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 party?
Adults |
Children |
Total |
4x3 |
5x3 |
9x3 |
|
Girls |
Boys |
|
|
2x5 |
1x5 |
|
12 u |
10 u |
5 u |
27 u |
(a)
The number of children is the combined repeated identity.
Number of boys = 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of children
= 15 u
= 15 x 4
= 60
(b)
Number of more children than adults
= 15 u - 12 u
= 3 u
= 3 x 4
= 12
Answer(s): (a) 60; (b) 12