exam Maths Puzzle Numerical Ability

There were 36 nickels, dimes and quarters whose value was $6. If there were three times as many quarters as nickels, how many coins of each kind were there?

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Can someone help me to solve the equation?

square root of x + 5 + x = 1 How do you identify the smallest subset of the real numbers that contains any given number? How would you apply that for the number e? We don't have a textbook, so I can't refer