Fill in the blanks.
Number of girls at first is 30% of the children.
Number of girls is then increased to 60%.
- 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 |
3 x 2 = 6 u |
7 x 2 = 14 u |
Change |
+ ? |
No change |
After |
3 x 7 = 21 u |
2 x 7 = 14 u |
(a)
Change percentage into units.
30% =
30100 =
310 60% =
60100 =
35 Fraction of the children who are boys at first
= 1 -
310 =
710 Fraction of the children who are boys in the end
= 1 -
35=
25 Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 7 and 2 = 14
Number of girls at first = 6 u
(b)
Number of girls in the end = 21 u
(c)
Increase in the number of girls
= 21 u - 6 u
= 15 u
(d)
Number of children in the end
= 21 u + 14 u
= 35 u
Answer(s): (a) 6; (b) 21; (c) 15; (d) 35