exam Maths Puzzle Numerical Ability

simplify (3x^3yz^-1)/(-12xy^-2z^2)

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exam Other Question

Can Someone help me:Solve the equaltiy

Five plus a number is at least 16. Can someone help me on this problem?

I need to use the distributive property to remove the parentheses in the following expression. I then need to simplify the result if possible.

1/4(20 + 16)

Thanks,
Sher