Fill in the blanks.
Number of girls at first is 60% 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 |
3 x 9 = 27 u |
2 x 9 = 18 u |
Change |
- ? |
No change |
After |
11 x 2 = 22 u |
9 x 2 = 18 u |
(a)
Change percentage into units.
60% =
60100 =
3555% =
55100 =
1120 Fraction of the children who are boys at first
= 1 -
35=
25 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 2 and 9 = 18
Number of girls at first = 27 u
(b)
Number of girls in the end = 22 u
(c)
Decrease in the number of girls
= 27 u - 22 u
= 5 u
(d)
Number of children in the end
= 22 u + 18 u
= 40 u
Answer(s): (a) 27; (b) 22; (c) 5; (d) 40