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 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 |
5 x 8 |
1 x 8 |
8 x 5 |
9 x 5 |
40 u |
8 u |
40 u |
45 u |
(a)
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 5 and 8 = 40
Class A
Girls : Boys
5 : 1
(x8) 40 : 8
Class B
Girls : Boys
8 : 9
(x5) 40 : 45
Number of girls in Class A = 40 u
(b)
Number of boys in Class B = 45 u
(c)
Number of children in Class B
= 40 u + 45 u
= 85 u
(d)
Number of children in Class A
= 40 u + 8 u
= 48 u
Total number of children
= 85 u + 48 u
= 133 u
Answer(s): (a) 40; (b) 45; (c) 85; (d) 133