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Maths Puzzle
Numerical Ability
Steven and Sarah can finish apiece of work in 18days. Steven can do the job himself in twenty-four days. If Sarah wanted to do the job alone, how long would it take her?
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The cost in dollars of manufacturing w wing nuts is given by the expression 0.07w + 13.3. Find the cost when 375 wing nuts are made. What is the average cost to manufacture one wing nut?
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