Fill in the blanks.
The ratio of the number of boys to the number of girls in Class A is 2 : 1.
The ratio of the number of boys to the number of girls in Class B is 3 : 5.
The number of boys is the same.
- Number of boys in Class A = _____ u
- Number of girls in Class B = _____ u
- Number of children in Class B = _____ u
- Total number of children = _____ u
Class A |
Class B |
Boys |
Girls |
Boys |
Girls |
2 x 3 |
1 x 3 |
3 x 2 |
5 x 2 |
6 u |
3 u |
6 u |
10 u |
(a)
Change ratio into units.
The number of boys in Class A and Class B is the same.
LCM of 2 and 3 = 6
Class A
Boys : Girls
2 : 1
(x3) 6 : 3
Class B
Boys : Girls
3 : 5
(x2) 6 : 10
Number of boys in Class A = 6 u
(b)
Number of girls in Class B = 10 u
(c)
Number of children in Class B
= 6 u + 10 u
= 16 u
(d)
Number of children in Class A
= 6 u + 3 u
= 9 u
Total number of children
= 16 u + 9 u
= 25 u
Answer(s): (a) 6; (b) 10; (c) 16; (d) 25