Interview Maths Puzzle Numerical Ability

A person had to multiply two numbers. Instead of multiplying by 35, he multiplied by 53 and the product went up by 540. What was the raised product?

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Interview Other Question

A man is known to speak truth 3 out of 4 times. He throws die and reports that it is a 6. The probability that it is actually a 6 is?

What is the sum of the squares of the first 20 natural numbers(1 to 20)?