exam Maths Puzzle Numerical Ability

f(x)=7x-4

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I have 4 numbers: 2/3, 5/8, 6, 6. I can only use those numbers and I can not make them into decimals. I need to make 24. How can I do this? if the area if a triangular sail is 10 square feet and the base is 4 feet long, find the sail height