Fill in the blanks.
The ratio of the number of boys to the number of girls in Class A is 8 : 7.
The ratio of the number of boys to the number of girls in Class B is 6 : 7.
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 |
8 x 3 |
7 x 3 |
6 x 4 |
7 x 4 |
24 u |
21 u |
24 u |
28 u |
(a)
Change ratio into units.
The number of boys in Class A and Class B is the same.
LCM of 8 and 6 = 24
Class A
Boys : Girls
8 : 7
(x3) 24 : 21
Class B
Boys : Girls
6 : 7
(x4) 24 : 28
Number of boys in Class A = 24 u
(b)
Number of girls in Class B = 28 u
(c)
Number of children in Class B
= 24 u + 28 u
= 52 u
(d)
Number of children in Class A
= 24 u + 21 u
= 45 u
Total number of children
= 52 u + 45 u
= 97 u
Answer(s): (a) 24; (b) 28; (c) 52; (d) 97