exam Maths Puzzle Numerical Ability

Please help me solve 9x square/8y square divided by 3x/16y to the 9th power.
The answer is 6x to the 4th y to the 7th. I got 6xy to the seventh.

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exam Other Question
a number is less than the sum of twice its oppisite and five. find the number Good afternoon gang. Can anyone show me the steps and answer for this problem?

Find the GCF for this group of monomials.



16x²z, 40xz², 72z³



Much appreciated.