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 6 : 7.
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 |
5 x 6 |
1 x 6 |
6 x 5 |
7 x 5 |
30 u |
6 u |
30 u |
35 u |
(a)
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 5 and 6 = 30
Class A
Girls : Boys
5 : 1
(x6) 30 : 6
Class B
Girls : Boys
6 : 7
(x5) 30 : 35
Number of girls in Class A = 30 u
(b)
Number of boys in Class B = 35 u
(c)
Number of children in Class B
= 30 u + 35 u
= 65 u
(d)
Number of children in Class A
= 30 u + 6 u
= 36 u
Total number of children
= 65 u + 36 u
= 101 u
Answer(s): (a) 30; (b) 35; (c) 65; (d) 101