Fill in the blanks.
Number of girls at first is 80% of the children.
Number of girls is then decreased to 55% 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 |
4 x 9 = 36 u |
1 x 9 = 9 u |
Change |
- ? |
No change |
After |
11 x 1 = 11 u |
9 x 1 = 9 u |
(a)
Change percentage into units.
80% =
80100 =
4555% =
55100 =
1120 Fraction of the children who are boys at first
= 1 -
45=
15 Fraction of the children who are boys in the end
= 1 -
1120=
920Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 1 and 9 = 9
Number of girls at first = 36 u
(b)
Number of girls in the end = 11 u
(c)
Decrease in the number of girls
= 36 u - 11 u
= 25 u
(d)
Number of children in the end
= 11 u + 9 u
= 20 u
Answer(s): (a) 36; (b) 11; (c) 25; (d) 20