For 165 children, 17 instructors need to be hired.
What is unitary method?
"A process of finding the value of a single unit, and based on that value we can find the required value."
For given question,
There are 165 children taking a swimming lessons at the pool.
10 children will be assigned to each instructor.
Total number of children = 165
10 children = 1 instructor
Let 'm' be the total number of instructors need to be hired.
Using unitary method,
\(\Rightarrow m=\frac{165}{10}\\\\ \Rightarrow m = 16.5\\\\ \Rightarrow m\approx 17\)
This means, 17 instructors need to be hired.
Therefore, for 165 children, 17 instructors need to be hired.
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