Fill in the blanks.
The ratio of the number of girls to the number of boys in Class A is 6 : 5.
The ratio of the number of girls to the number of boys in Class B is 8 : 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 4 |
5 x 4 |
8 x 3 |
9 x 3 |
24 u |
20 u |
24 u |
27 u |
(a)
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 6 and 8 = 24
Class A
Girls : Boys
6 : 5
(x4) 24 : 20
Class B
Girls : Boys
8 : 9
(x3) 24 : 27
Number of girls in Class A = 24 u
(b)
Number of boys in Class B = 27 u
(c)
Number of children in Class B
= 24 u + 27 u
= 51 u
(d)
Number of children in Class A
= 24 u + 20 u
= 44 u
Total number of children
= 51 u + 44 u
= 95 u
Answer(s): (a) 24; (b) 27; (c) 51; (d) 95