exam Maths Puzzle Numerical Ability

Please can you help me solve x

(((3 + 3/x = 7)))

Thank you

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exam Other Question

How many pounds of 70% Columbian coffee must be added to ten pounds of 90% Columbian coffee to have p% Columbian coffee? An investment of $20,000.00 will be doubled in 14 years with interest compounded continuously. Find the annual interest rate