book Maths Puzzle Numerical Ability

((((((((Find a third degree polynomialwith real coefficients and with zeros 1 and 3+i.))))))))

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The ratio of students to teachers in a school is 18.5 to 1. If there are 1369 students in the school, how many teachers are there?

I know how to do proportions but I have no ide Hazel has $2.40 in nickels, dimes and quarters. She has twice as many nickels as quarters, and twice as many quarters as dimes. How many of each type does she have?