book Maths Puzzle Numerical Ability

Here's my question: Caliber is a unit used to indicate the diameter of a bullet in hundreths of an inch. The IMI 50 caliber cartridge-loading handgun with standard-issue shells and

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book Other Question

Locate the foci with this equation:

(x-5)*/5* + (y-3)*/10*

KEY:
*= squared. (EX: 5squared) How much of an alloy which contains 6 grams of gold in 10 grams must be melted with another alloy which contains 3 grams of gold in 10 grams, to give an alloy containing 5 grams of