exam Maths Puzzle Numerical Ability

A two-digit number is three less than seven times the sum of its digits. If the digits are reversed, the new number is 18 less than the original number. What is the original number?

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exam Other Question

Divide.
50p9q5/10pq2

and please show me how...I am struggling with figuring this out. Find all numbers for which the rational expression is undefined. Simplify your answer. Use an integer or a fraction. Use a comma to separate answers as needed.