Fill in the blanks.
Number of boys at first is 25% of the children.
Number of boys is then increased to 50%.
- Number of boys at first = _____ u
- Number of boys in the end = _____ u
- Increase in the number of boys = _____ u
- Number of children in the end = _____ u
|
Boys |
Girls |
Before |
1 x 1 = 1 u |
3 x 1 = 3 u |
Change |
+ ? |
No change |
After |
1 x 3 = 3 u |
1 x 3 = 3 u |
(a)
Change percentage into units.
25% =
25100 =
14 50% =
50100 =
12 Fraction of the children who are girls at first
= 1 -
14 =
34 Fraction of the children who are girls in the end
= 1 -
12=
12 Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 3 and 1 = 3
Number of boys at first = 1 u
(b)
Number of boys in the end = 3 u
(c)
Increase in the number of boys
= 3 u - 1 u
= 2 u
(d)
Number of children in the end
= 3 u + 3 u
= 6 u
Answer(s): (a) 1; (b) 3; (c) 2; (d) 6