Fill in the blanks.
Number of boys at first is 65% 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 |
13 x 2 = 26 u |
7 x 2 = 14 u |
Change |
- ? |
No change |
After |
3 x 7 = 21 u |
2 x 7 = 14 u |
(a)
Change percentage into units.
65% =
65100 =
132060% =
60100 =
35 Fraction of the children who are girls at first
= 1 -
1320=
720 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 7 and 2 = 14
Number of boys at first = 26 u
(b)
Number of boys in the end = 21 u
(c)
Decrease in the number of boys
= 26 u - 21 u
= 5 u
(d)
Number of children in the end
= 21 u + 14 u
= 35 u
Answer(s): (a) 26; (b) 21; (c) 5; (d) 35