Fill in the blanks.
Number of boys at first is 35% 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 |
7 x 3 = 21 u |
13 x 3 = 39 u |
Change |
+ ? |
No change |
After |
7 x 13 = 91 u |
3 x 13 = 39 u |
(a)
Change percentage into units.
35% =
35100 =
720 70% =
70100 =
710 Fraction of the children who are girls at first
= 1 -
720 =
1320 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 13 and 3 = 39
Number of boys at first = 21 u
(b)
Number of boys in the end = 91 u
(c)
Increase in the number of boys
= 91 u - 21 u
= 70 u
(d)
Number of children in the end
= 91 u + 39 u
= 130 u
Answer(s): (a) 21; (b) 91; (c) 70; (d) 130