book Maths Puzzle Numerical Ability

nine is greater than three times a number s.

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book Other Question

Everyone has a $100.00 and must spend it to buy 100lb of gas. Nitrogen costs .50cents lb, hygrogen costs $3.00lb, and Oxygen $10.00lb. How many of lbs of each can you buy? what is the exact value of 6cos(-61pie/6) - 2sin(13pie/4)