exam Maths Puzzle Numerical Ability

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The loudness of sound is based on intensity level measured in decibels using a logarithmic scale and is relative to (a ratio of) the weak

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Suppose that four times the square of a number equals 20 times that number. what is the number? Hi all see this 2 Questions plz
1- A die was rolled 720 times , what is the probability that the number 4 will be exactly 125 times ?

2- What is the probability of getting at most three heads in 8 flips of balanced coin ?