Fill in the blanks.
The ratio of the number of boys to the number of girls in Class A is 10 : 1.
The ratio of the number of boys to the number of girls in Class B is 8 : 9.
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 |
10 x 4 |
1 x 4 |
8 x 5 |
9 x 5 |
40 u |
4 u |
40 u |
45 u |
(a)
Change ratio into units.
The number of boys in Class A and Class B is the same.
LCM of 10 and 8 = 40
Class A
Boys : Girls
10 : 1
(x4) 40 : 4
Class B
Boys : Girls
8 : 9
(x5) 40 : 45
Number of boys in Class A = 40 u
(b)
Number of girls 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 + 4 u
= 44 u
Total number of children
= 85 u + 44 u
= 129 u
Answer(s): (a) 40; (b) 45; (c) 85; (d) 129