Fill in the blanks.
The ratio of the number of girls to the number of boys in Class A is 6 : 1.
The ratio of the number of girls to the number of boys in Class B is 5 : 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 |
6 x 5 |
1 x 5 |
5 x 6 |
9 x 6 |
30 u |
5 u |
30 u |
54 u |
(a)
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 6 and 5 = 30
Class A
Girls : Boys
6 : 1
(x5) 30 : 5
Class B
Girls : Boys
5 : 9
(x6) 30 : 54
Number of girls in Class A = 30 u
(b)
Number of boys in Class B = 54 u
(c)
Number of children in Class B
= 30 u + 54 u
= 84 u
(d)
Number of children in Class A
= 30 u + 5 u
= 35 u
Total number of children
= 84 u + 35 u
= 119 u
Answer(s): (a) 30; (b) 54; (c) 84; (d) 119