Fill in the blanks.
Number of girls at first is 20% of the children.
Number of girls is then increased to 75%.
- 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 1 = 1 u |
4 x 1 = 4 u |
Change |
+ ? |
No change |
After |
3 x 4 = 12 u |
1 x 4 = 4 u |
(a)
Change percentage into units.
20% =
20100 =
15 75% =
75100 =
34 Fraction of the children who are boys at first
= 1 -
15 =
45 Fraction of the children who are boys in the end
= 1 -
34=
14 Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 4 and 1 = 4
Number of girls at first = 1 u
(b)
Number of girls in the end = 12 u
(c)
Increase in the number of girls
= 12 u - 1 u
= 11 u
(d)
Number of children in the end
= 12 u + 4 u
= 16 u
Answer(s): (a) 1; (b) 12; (c) 11; (d) 16