exam Maths Puzzle Numerical Ability

In a certain mill the cost C in thousands of dollars of producing x tons of steel is given by: C=0.3+3.5

The revenue R in thousands of dollars from selling x tons is given by:

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exam Other Question

A fuel oil storage depot had an 8 week supply on hand. However, cold weather caused the supply to be used in 6 weeks when 20 000 L extra were used each week. How many litres were in the original supply? 60-(2*9)+3^2