Fill in the blanks.
The ratio of the number of girls to the number of boys in Class A is 2 : 1.
The ratio of the number of girls to the number of boys in Class B is 7 : 8.
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 |
2 x 7 |
1 x 7 |
7 x 2 |
8 x 2 |
14 u |
7 u |
14 u |
16 u |
(a)
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 2 and 7 = 14
Class A
Girls : Boys
2 : 1
(x7) 14 : 7
Class B
Girls : Boys
7 : 8
(x2) 14 : 16
Number of girls in Class A = 14 u
(b)
Number of boys in Class B = 16 u
(c)
Number of children in Class B
= 14 u + 16 u
= 30 u
(d)
Number of children in Class A
= 14 u + 7 u
= 21 u
Total number of children
= 30 u + 21 u
= 51 u
Answer(s): (a) 14; (b) 16; (c) 30; (d) 51