book Maths Puzzle Numerical Ability

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

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book Other Question

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) How many liters (L) of a 10% silver iodide solution must be mixed with 7 L of a 4% silver iodide solution to get a 6% solution?