Fill in the blanks.
Number of boys at first is 90% of the children.
Number of boys is then decreased to 85% 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 |
9 x 3 = 27 u |
1 x 3 = 3 u |
Change |
- ? |
No change |
After |
17 x 1 = 17 u |
3 x 1 = 3 u |
(a)
Change percentage into units.
90% =
90100 =
91085% =
85100 =
1720 Fraction of the children who are girls at first
= 1 -
910=
110 Fraction of the children who are girls in the end
= 1 -
1720=
320Number of girls at first and in the end remains the same.
The number of girls is the unchanged quantity.
LCM of 1 and 3 = 3
Number of boys at first = 27 u
(b)
Number of boys in the end = 17 u
(c)
Decrease in the number of boys
= 27 u - 17 u
= 10 u
(d)
Number of children in the end
= 17 u + 3 u
= 20 u
Answer(s): (a) 27; (b) 17; (c) 10; (d) 20