Fill in the blanks.
Number of boys at first is 15% of the children.
Number of boys is then increased to 70%.
- 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 3 = 9 u |
17 x 3 = 51 u |
Change |
+ ? |
No change |
After |
7 x 17 = 119 u |
3 x 17 = 51 u |
(a)
Change percentage into units.
15% =
15100 =
320 70% =
70100 =
710 Fraction of the children who are girls at first
= 1 -
320 =
1720 Fraction of the children who are girls in the end
= 1 -
710=
310 Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 17 and 3 = 51
Number of boys at first = 9 u
(b)
Number of boys in the end = 119 u
(c)
Increase in the number of boys
= 119 u - 9 u
= 110 u
(d)
Number of children in the end
= 119 u + 51 u
= 170 u
Answer(s): (a) 9; (b) 119; (c) 110; (d) 170