Fill in the blanks.
Number of boys at first is 5% 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 |
19 x 1 = 19 u |
Change |
+ ? |
No change |
After |
1 x 19 = 19 u |
1 x 19 = 19 u |
(a)
Change percentage into units.
5% =
5100 =
120 50% =
50100 =
12 Fraction of the children who are girls at first
= 1 -
120 =
1920 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 19 and 1 = 19
Number of boys at first = 1 u
(b)
Number of boys in the end = 19 u
(c)
Increase in the number of boys
= 19 u - 1 u
= 18 u
(d)
Number of children in the end
= 19 u + 19 u
= 38 u
Answer(s): (a) 1; (b) 19; (c) 18; (d) 38