Fill in the blanks.
30% of the boys are equal to 90% of the girls.
- Number of boys = _____ u
- Number of girls = _____ u
- Total number of boys and girls = _____ u
- Difference between the number of boys and girls = _____ u
(a)
Change percentage into units.
30% =
30100 =
31090% =
90100 =
910310 of the boys =
910 of the girls
Make the numerators the same using the LCM of 3 and 9.
LCM of 3 and 9 = 9
3 x 310 x 3 of the boys =
9 x 110 x 1 of the girls
930 of the boys =
910 of the girls
The totals are shown in the denominators.
Number of boys = 30 u
(b)
Number of girls = 10 u
(c)
Total number of boys and girls
= 30 u + 10 u
= 40 u
(d)
Difference between the number of boys and girls
= 30 u - 10 u
= 20 u
Answer(s): (a) 30; (b) 10; (c) 40; (d) 20