book Maths Puzzle Numerical Ability

suppose that f(x)=ax+b if (f(x))=8x+21 then what a+b

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What Does t equal in 8t-r=12t 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?