exam Maths Puzzle Numerical Ability

a company makes two chemical: Type I and type II. Due to storage problems, a maximum of 100lbs of type I and 150lbs of type IIcan be mixed and packaged each year. 1 lb of type I ta

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29. A bookstore can purchase several calculators for a total cost of $120. If each calculator cost $1 less, the bookstore could purchase 10 additional calculators at the same total cost. How many calculators can be purchased at the regular price? The scores on a multiple-choice test taken by 2000 students were normally distributed with a mean of 60 and a standard deviation of 6. Find the z-score corresponding to the test sc