Fill in the blanks.
Number of boys at first is 70% of the children.
Number of boys is then decreased to 65% 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 7 = 49 u |
3 x 7 = 21 u |
Change |
- ? |
No change |
After |
13 x 3 = 39 u |
7 x 3 = 21 u |
(a)
Change percentage into units.
70% =
70100 =
71065% =
65100 =
1320 Fraction of the children who are girls at first
= 1 -
710=
310 Fraction of the children who are girls in the end
= 1 -
1320=
720Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 3 and 7 = 21
Number of boys at first = 49 u
(b)
Number of boys in the end = 39 u
(c)
Decrease in the number of boys
= 49 u - 39 u
= 10 u
(d)
Number of children in the end
= 39 u + 21 u
= 60 u
Answer(s): (a) 49; (b) 39; (c) 10; (d) 60