exam Maths Puzzle Numerical Ability

The difference of 2 numbers is 4. The difference between their reciprocals is 4/21. Find the 2 numbers

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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. HOW WOULD I SIMPLIFY THIS EXPRESSION

1/y - 1/y-3