Fill in the blanks.
Number of girls at first is 90% of the children.
Number of girls is then decreased to 60% of the children.
- Number of girls at first = _____ u
- Number of girls in the end = _____ u
- Decrease in the number of girls = _____ u
- Number of children in the end = _____ u
|
Girls |
Boys |
Before |
9 x 2 = 18 u |
1 x 2 = 2 u |
Change |
- ? |
No change |
After |
3 x 1 = 3 u |
2 x 1 = 2 u |
(a)
Change percentage into units.
90% =
90100 =
91060% =
60100 =
35 Fraction of the children who are boys at first
= 1 -
910=
110 Fraction of the children who are boys in the end
= 1 -
35=
25Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 1 and 2 = 2
Number of girls at first = 18 u
(b)
Number of girls in the end = 3 u
(c)
Decrease in the number of girls
= 18 u - 3 u
= 15 u
(d)
Number of children in the end
= 3 u + 2 u
= 5 u
Answer(s): (a) 18; (b) 3; (c) 15; (d) 5