book Maths Puzzle Numerical Ability

Tony is 6 years older than his brother. 4 years ago, he was twice as old

How old is Tony
How old is his brother

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book Other Question

What is the solution to

(log base 16 of x) + (log base 4 of x ) + (log base 2 of x) = 7
I cant figure out how to solve this equation. 2(2x+9)=-16 Can you please help me?