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Maths Puzzle
Numerical Ability
express as the same function of a positive acute angle of sec -123 degress not using a calculator.
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book Other Question
How many liters of pure alcohol must be added to a 100-liter solution that is 20 percent alcohol in order to produce a solution that is 25 percent alcohol?
A coffee seller has one grade of coffee selling for $4 per pound and another for $6.50 per pound. He mixes the coffee to sell at $4.75 per pound and mixes 150 pounds. How much of each type does he use?
How do you do this?