Fill in the blanks.
The ratio of the number of girls to the number of boys in Class A is 4 : 1.
The ratio of the number of girls to the number of boys in Class B is 7 : 8.
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 |
4 x 7 |
1 x 7 |
7 x 4 |
8 x 4 |
28 u |
7 u |
28 u |
32 u |
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 4 and 7 = 28
Number of children in Class A
= 28 u + 7 u
= 35 u
Number of children in Class B
= 28 u + 32 u
= 60 u
Difference in the number of children in Class A and Class B
= 60 u - 35 u
= 25 u
(b)
Number of boys in Class A = 7 u
Number of boys in Class B = 32 u
Difference in the number of boys in Class A and Class B
= 32 u - 7 u
= 25 u
(c)
Number of girls in Class A = 28 uNumber of girls in Class B = 28 u Total number of girls = 28 u + 28 u= 56 u (d)
Total number of boys in Class A and Class B
= 32 u + 7 u
= 39 u
Answer(s)
: (a) 25; (b) 25; (c) 56; (d) 39