Fill in the blanks.
Number of boys at first is 70% of the children.
Number of boys is then decreased to 60% of the children.
- Number of boys at first = _____ u
- Number of boys in the end = _____ u
- Decrease in the number of boys = _____ u
- Number of children in the end = _____ u
|
Boys |
Girls |
Before |
7 x 2 = 14 u |
3 x 2 = 6 u |
Change |
- ? |
No change |
After |
3 x 3 = 9 u |
2 x 3 = 6 u |
(a)
Change percentage into units.
70% =
70100 =
71060% =
60100 =
35 Fraction of the children who are girls at first
= 1 -
710=
310 Fraction of the children who are girls in the end
= 1 -
35=
25Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 3 and 2 = 6
Number of boys at first = 14 u
(b)
Number of boys in the end = 9 u
(c)
Decrease in the number of boys
= 14 u - 9 u
= 5 u
(d)
Number of children in the end
= 9 u + 6 u
= 15 u
Answer(s): (a) 14; (b) 9; (c) 5; (d) 15