Fill in the blanks.
Number of boys at first is 40% of the children.
Number of boys is then increased to 45%.
- 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 |
2 x 11 = 22 u |
3 x 11 = 33 u |
Change |
+ ? |
No change |
After |
9 x 3 = 27 u |
11 x 3 = 33 u |
(a)
Change percentage into units.
40% =
40100 =
25 45% =
45100 =
920 Fraction of the children who are girls at first
= 1 -
25 =
35 Fraction of the children who are girls in the end
= 1 -
920=
1120 Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 3 and 11 = 33
Number of boys at first = 22 u
(b)
Number of boys in the end = 27 u
(c)
Increase in the number of boys
= 27 u - 22 u
= 5 u
(d)
Number of children in the end
= 27 u + 33 u
= 60 u
Answer(s): (a) 22; (b) 27; (c) 5; (d) 60