book Maths Puzzle Numerical Ability

Suppose that in a company with 5000 employees, the monthly salaries are normally distributed. The mean salary is $3200, with a standard deviation of $600. About how many of the e

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If a,b, and c are consective positive integers, show that (6/5)<= (a/(b+c)) + (b/(a+c)) + (c/(a+b)) <= 2 What is complementary angle