Fill in the blanks.
70% 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.
70% =
70100 =
71090% =
90100 =
910710 of the boys =
910 of the girls
Make the numerators the same using the LCM of 7 and 9.
LCM of 7 and 9 = 63
7 x 910 x 9 of the boys =
9 x 710 x 7 of the girls
6390 of the boys =
6370 of the girls
The totals are shown in the denominators.
Number of boys = 90 u
(b)
Number of girls = 70 u
(c)
Total number of boys and girls
= 90 u + 70 u
= 160 u
(d)
Difference between the number of boys and girls
= 90 u - 70 u
= 20 u
Answer(s): (a) 90; (b) 70; (c) 160; (d) 20