Fill in the blanks.
Number of girls at first is 75% of the children.
Number of girls is then decreased to 65% of the children.
- Number of girls at first = _____ u
- Number of girls in the end = _____ u
- Decrease in the number of girls = _____ u
- Number of children in the end = _____ u
|
Girls |
Boys |
Before |
3 x 7 = 21 u |
1 x 7 = 7 u |
Change |
- ? |
No change |
After |
13 x 1 = 13 u |
7 x 1 = 7 u |
(a)
Change percentage into units.
75% =
75100 =
3465% =
65100 =
1320 Fraction of the children who are boys at first
= 1 -
34=
14 Fraction of the children who are boys in the end
= 1 -
1320=
720Number of boys at first and in the end remains the same.
The number of boys is the unchanged quantity.
LCM of 1 and 7 = 7
Number of girls at first = 21 u
(b)
Number of girls in the end = 13 u
(c)
Decrease in the number of girls
= 21 u - 13 u
= 8 u
(d)
Number of children in the end
= 13 u + 7 u
= 20 u
Answer(s): (a) 21; (b) 13; (c) 8; (d) 20