Fill in the blanks.
Number of girls at first is 20% of the children.
Number of girls is then increased to 45%.
- Number of girls at first = _____ u
- Number of girls in the end = _____ u
- Increase in the number of girls = _____ u
- Number of children in the end = _____ u
|
Girls |
Boys |
Before |
1 x 11 = 11 u |
4 x 11 = 44 u |
Change |
+ ? |
No change |
After |
9 x 4 = 36 u |
11 x 4 = 44 u |
(a)
Change percentage into units.
20% =
20100 =
15 45% =
45100 =
920 Fraction of the children who are boys at first
= 1 -
15 =
45 Fraction of the children who are boys in the end
= 1 -
920=
1120 Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 4 and 11 = 44
Number of girls at first = 11 u
(b)
Number of girls in the end = 36 u
(c)
Increase in the number of girls
= 36 u - 11 u
= 25 u
(d)
Number of children in the end
= 36 u + 44 u
= 80 u
Answer(s): (a) 11; (b) 36; (c) 25; (d) 80