Fill in the blanks.
The ratio of the number of girls to the number of boys in Class A is 3 : 1.
The ratio of the number of girls to the number of boys in Class B is 2 : 9.
The number of girls is the same.
- Number of girls in Class A = _____ u
- Number of boys in Class B = _____ u
- Number of children in Class B = _____ u
- Total number of children = _____ u
Class A |
Class B |
Girls |
Boys |
Girls |
Boys |
3 x 2 |
1 x 2 |
2 x 3 |
9 x 3 |
6 u |
2 u |
6 u |
27 u |
(a)
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 3 and 2 = 6
Class A
Girls : Boys
3 : 1
(x2) 6 : 2
Class B
Girls : Boys
2 : 9
(x3) 6 : 27
Number of girls in Class A = 6 u
(b)
Number of boys in Class B = 27 u
(c)
Number of children in Class B
= 6 u + 27 u
= 33 u
(d)
Number of children in Class A
= 6 u + 2 u
= 8 u
Total number of children
= 33 u + 8 u
= 41 u
Answer(s): (a) 6; (b) 27; (c) 33; (d) 41