exam Maths Puzzle Numerical Ability

I have the number 25. That was the total after taking 75% off. How do we find the original number? What is the mathematical equation?

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exam Other Question
Show that 165,342,985 and 13 are relatively prime? please help me,
show whether or not(5,3) is a solution of the system:
3x+2y=21
x+y=8