Fill in the blanks.
Number of boys at first is 85% of the children.
Number of boys is then decreased to 80% 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 |
17 x 1 = 17 u |
3 x 1 = 3 u |
Change |
- ? |
No change |
After |
4 x 3 = 12 u |
1 x 3 = 3 u |
(a)
Change percentage into units.
85% =
85100 =
172080% =
80100 =
45 Fraction of the children who are girls at first
= 1 -
1720=
320 Fraction of the children who are girls in the end
= 1 -
45=
15Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 3 and 1 = 3
Number of boys at first = 17 u
(b)
Number of boys in the end = 12 u
(c)
Decrease in the number of boys
= 17 u - 12 u
= 5 u
(d)
Number of children in the end
= 12 u + 3 u
= 15 u
Answer(s): (a) 17; (b) 12; (c) 5; (d) 15