Fill in the blanks.
The ratio of the number of girls to the number of boys in Class A is 3 : 2.
The ratio of the number of girls to the number of boys in Class B is 5 : 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 |
3 x 5 |
2 x 5 |
5 x 3 |
8 x 3 |
15 u |
10 u |
15 u |
24 u |
(a)
Change ratio into units.
The number of girls in Class A and Class B is the same.
LCM of 3 and 5 = 15
Class A
Girls : Boys
3 : 2
(x5) 15 : 10
Class B
Girls : Boys
5 : 8
(x3) 15 : 24
Number of girls in Class A = 15 u
(b)
Number of boys in Class B = 24 u
(c)
Number of children in Class B
= 15 u + 24 u
= 39 u
(d)
Number of children in Class A
= 15 u + 10 u
= 25 u
Total number of children
= 39 u + 25 u
= 64 u
Answer(s): (a) 15; (b) 24; (c) 39; (d) 64