SolutionGiven that of the people surveyed, 58% were at most 40 years old and 70% were at most 60 years old.

Therefore, 70%−58%, or 12%, of the people surveyed were more than 40 years old and at most 60 years old, and we are given that 252 people are in this group.

Let x be the total number of people in the survey. Then 12% of x is 252, that is, 0.12x=252.

Solving for x we have x = \(\frac{252}{0.12}\)= 2100.

Hence Option B is the right answer.

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Sandy

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