book Maths Puzzle Numerical Ability

Suppose C=(2,8,9), D=(4,8,12), and E=(6,8,9).
a. Find (C union D)intersection E b.Find C union(d intersection E)

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book Other Question

Solve.

x^2-2x=-13

Thank you A work crew of 3 people requires 3 weeks and 2 days to do a certain job. How long would it take a work crew of 4 people to do the same job if each person of both crews works at th