book Maths Puzzle Numerical Ability

What is the answer to 5^2x = 8?

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book Other Question

I'm having a hard time on this one. Can someone please help me solve it?

3^4x+5 = 9
That is 3 raised to the power 4x + 5 equals 9 - Solve for X

Thank you You land on a island in which everything is 12 times a large. If you encounter a giant who is shaped exactly like you, but is 12 times as tall. then the weight of that giant is ???