There are 2 groups of operators in a plant. There are 3 more operators in the first group than the second group. Each operator in the first group makes 8 toys in a minute but each operator in the second group makes only 4 toys in a minute. Both groups make a total of 11520 toys in 4 hours.
- How many operators are there in the first group?
- How many operators are there in the second group?
|
First group |
Second group |
Number |
1 u + 3 |
1 u |
Value |
8 |
4 |
Total value |
8 u + 24 |
4 u |
Number of operators in first group = 1 u + 3
Number of operators in second group = 1 u
Total number of toys made
= 8 u + 24 + 4 u
= 12 u + 24
1 h = 60 min
4 h = 4 x 60 = 240 min
Total number of toys made in 1 min
= 11520 ÷ 240
= 48
12 u + 24 = 48
12 u = 48 - 24
12 u = 24
1 u = 24 ÷ 12 = 2
Number of operators in the first group
= 1 u + 3
= 2 + 3
= 5
(b)
Number of operators in the second group
= 1 u
= 2
Answer(s): (a) 5; (b) 2