book Maths Puzzle Numerical Ability

64^x=4

please help if you do not mind. thank you very much

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book Other Question

if A is 3 yrs older than B and B is twice of the age of C..the total sum of ages are 30 then what is the age of B? Kyle weighs twice as much as his younger sister Suzanne and 10 pounds less than his older sister Margaret. All together they weigh 90 pounds. How much does Margaret Weigh.