Fill in the blanks.
Number of girls at first is 25% of the children.
Number of girls is then increased to 30%.
- 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 7 = 7 u |
3 x 7 = 21 u |
Change |
+ ? |
No change |
After |
3 x 3 = 9 u |
7 x 3 = 21 u |
(a)
Change percentage into units.
25% =
25100 =
14 30% =
30100 =
310 Fraction of the children who are boys at first
= 1 -
14 =
34 Fraction of the children who are boys in the end
= 1 -
310=
710 Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 3 and 7 = 21
Number of girls at first = 7 u
(b)
Number of girls in the end = 9 u
(c)
Increase in the number of girls
= 9 u - 7 u
= 2 u
(d)
Number of children in the end
= 9 u + 21 u
= 30 u
Answer(s): (a) 7; (b) 9; (c) 2; (d) 30