Fill in the blanks.
Number of girls at first is 5% of the children.
Number of girls is then increased to 70%.
- 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 3 = 3 u |
19 x 3 = 57 u |
Change |
+ ? |
No change |
After |
7 x 19 = 133 u |
3 x 19 = 57 u |
(a)
Change percentage into units.
5% =
5100 =
120 70% =
70100 =
710 Fraction of the children who are boys at first
= 1 -
120 =
1920 Fraction of the children who are boys in the end
= 1 -
710=
310 Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 19 and 3 = 57
Number of girls at first = 3 u
(b)
Number of girls in the end = 133 u
(c)
Increase in the number of girls
= 133 u - 3 u
= 130 u
(d)
Number of children in the end
= 133 u + 57 u
= 190 u
Answer(s): (a) 3; (b) 133; (c) 130; (d) 190