Which tool is used to hold workpieces tightly so that both of your hands can be free to work on them?
2 answers:
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Answer:
The sum of ages of all 18 pupils in the class = 81
Step-by-step explanation:
Total number of pupil in the class = 18
Average of years in the class =
Now,
⇒Average of sum of ages in the class = 4.05
Let us assume the sum of ages of all students in the class = m
By the formula for AVERAGE:
or, m = 18 x 4.5 = 81
Hence, the sum of ages of all 18 pupils in the class = 81
So for this, we will be using proportions. In this case, our proportion will be
Firstly, cross-multiply: 36 = 3x
Next, divide both sides by 3 and your answer will be: 12 = x