exam Maths Puzzle Numerical Ability

Solve the following problems.
What expression raised to the fourth power is 81x^12y^8z^16 ?

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exam Other Question

the sum of one half of the first even integer, one third of the third even integer and one fourth of the fifth even integer is equal to 12. What are the 5 consecutive even integers? was wandering if any one could help me with this

1/6f-5=1

-36 is this right, thank you for you time.