Fill in the blanks.
The ratio of the number of girls to the number of boys in Class A is 5 : 1.
The ratio of the number of girls to the number of boys in Class B is 8 : 9.
The number of girls is the same.
- Difference in the number of children in Class A and Class B = _____ u
- Difference in the number of boys in Class A and Class B = _____ u
- Total number of girls = _____ u
- Total number of boys = _____ u
(a)
Class A |
Class B |
Girls |
Boys |
Girls |
Boys |
5 x 8 |
1 x 8 |
8 x 5 |
9 x 5 |
40 u |
8 u |
40 u |
45 u |
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 5 and 8 = 40
Number of children in Class A
= 40 u + 8 u
= 48 u
Number of children in Class B
= 40 u + 45 u
= 85 u
Difference in the number of children in Class A and Class B
= 85 u - 48 u
= 37 u
(b)
Number of boys in Class A = 8 u
Number of boys in Class B = 45 u
Difference in the number of boys in Class A and Class B
= 45 u - 8 u
= 37 u
(c)
Number of girls in Class A = 40 uNumber of girls in Class B = 40 u Total number of girls = 40 u + 40 u= 80 u (d)
Total number of boys in Class A and Class B
= 45 u + 8 u
= 53 u
Answer(s)
: (a) 37; (b) 37; (c) 80; (d) 53