exam Maths Puzzle Numerical Ability

9*9=X
X=?

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Ans is 9*9 =81
9 years agoHelpfull: Yes(0) No(0)

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Tutor could you help me please with this problem?
Thank you very much!

13a-15b-a+2b= Please help me find the other extreme of this: ratical 24 is the geometric mean between a and b. Find b if a=2