Fill in the blanks.
Number of boys at first is 15% of the children.
Number of boys is then increased to 75%.
- 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 |
3 x 1 = 3 u |
17 x 1 = 17 u |
Change |
+ ? |
No change |
After |
3 x 17 = 51 u |
1 x 17 = 17 u |
(a)
Change percentage into units.
15% =
15100 =
320 75% =
75100 =
34 Fraction of the children who are girls at first
= 1 -
320 =
1720 Fraction of the children who are girls in the end
= 1 -
34=
14 Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 17 and 1 = 17
Number of boys at first = 3 u
(b)
Number of boys in the end = 51 u
(c)
Increase in the number of boys
= 51 u - 3 u
= 48 u
(d)
Number of children in the end
= 51 u + 17 u
= 68 u
Answer(s): (a) 3; (b) 51; (c) 48; (d) 68