exam Maths Puzzle Numerical Ability

How do you solve this exactly?

log(x+20)-log(x+2)=log x

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exam Other Question

Sally paints a house in 4 hours, John can paint the same house in 6 hours, how long will it take for Sally and John to paint the house together? WHAT IS THE FORMULA FOR FINDING ONE SIDE OF A RIGHT TRIANGLE IF ONE SIDE AND THE HYPOTENUSE ARE KNOWN?