book Maths Puzzle Numerical Ability

How many pounds of chocolates costing $4.60 per pound may be mixed with 6 lb of chocolates costing $5 per pound to produce a mixture that can be sold for $4.90 per pound?

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book Other Question

Let T be a linear operator in V. Prove that T^2 = 0 if and only if the range T is a subset of null T. The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. A baby is premature if it is born three weeks early. What percentage of babies are born prematurely?