book Maths Puzzle Numerical Ability

THe gym is 21 years newer than the auditorium. The gym is also one fourth as old as the audtorium. How ol d is each building? Choices for auditoriums age 26, 27, 28

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book Other Question

simplify the following algebraic expression

(2x^5)^3 (-3x^4)^3
Set of all leaves on a tree. {Infinite Set/Finite Set}