Fill in the blanks.
For (a) to (c), give the answers in units (Eg 1 u) or unit equations (Eg 1 u + 2).
For (d), give the answer in numbers. (Eg 1)
100 children are in a school.
There are 80 less boys than girls.
Let the smaller group be 1 u.
- Number of boys = _____
- Number of girls = _____
- Total number of children = _____
- 1 u = _____
(a)
Let the smaller group to 1 u.
There are 80 less boys than girls.
The number of boys is the smaller group.
Number of boys = 1 u
(b)
Number of girls = 1 u + 80
(c)
Total number of children
= 1 u + 1 u + 80
= 2 u + 80
(d)
Total number of children = 100
2 u + 80 = 100
2 u = 100 - 80 = 20
2 u = 20
1 u = 20 ÷ 2 = 10
Answer(s): (a) 1 u; (b) 1 u + 80; (c) 2 u + 80; (d) 10