book Maths Puzzle Numerical Ability

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?

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suppose that f(x)=ax+b if (f(x))=8x+21 then what a+b please help me solve this problem:
Mike and Ela each has some money in the bank which pays interest at the rate of 4% per year. They use the total interest each year whi