exam Maths Puzzle Numerical Ability

If one-half thenumber is subtracted from five-sixths of the number,the difference is 6. Find the number

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exam Other Question

the resistance of an electric wire is directly proportional to the length of the wire and inversely proportional to the square of the diameter. Write a formula expressing this property using R for resistance, L for length, and D for diameter. i have a triangle and one side is 28 ft., the other 25 ft. and i need to find the measurement of the third side which is also the longest side