At a carnival, the children were put into two groups. 34 of Group A were girls and 45 of Group B were boys. Group B had thrice as many children as Group A. There were 27 fewer girls in Group A than Group B.
- What fraction of the total number of children at the carnival were girls? Give your answer in the simplest form.
- What was the total number of children at the carnival?
Group A |
Group B |
Total |
1x4x5 = 20 u |
3x4x5 = 60 u |
4x4x5 = 80 u |
Girls |
Boys |
Girls |
Boys |
|
3x5 |
1x5 |
1x12 |
4x12 |
|
15 u |
5 u |
12 u |
48 u |
|
(a)
The number of children in Group A is repeated. Make the number of children in Group A the same. LCM of 1 and 4 is 4.
The number of children in Group B is repeated. Make the number of children in Group B the same. LCM of 5 and 12 is 60.
GirlsTotal =
15 + 1220 + 60 =
2780 (b)
Number of fewer girls in Group A than Group B
= 15 u - 12 u
= 3 u
3 u = 27
1 u = 27 ÷ 3 = 9
Total number of children
= 80 u
= 80 x 9
= 720
Answer(s): (a)
2780; (b) 720