Fill in the blanks.
Number of girls at first is 30% of the children.
Number of girls is then increased to 50%.
- 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 1 = 3 u |
7 x 1 = 7 u |
Change |
+ ? |
No change |
After |
1 x 7 = 7 u |
1 x 7 = 7 u |
(a)
Change percentage into units.
30% =
30100 =
310 50% =
50100 =
12 Fraction of the children who are boys at first
= 1 -
310 =
710 Fraction of the children who are boys in the end
= 1 -
12=
12 Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 7 and 1 = 7
Number of girls at first = 3 u
(b)
Number of girls in the end = 7 u
(c)
Increase in the number of girls
= 7 u - 3 u
= 4 u
(d)
Number of children in the end
= 7 u + 7 u
= 14 u
Answer(s): (a) 3; (b) 7; (c) 4; (d) 14