exam Maths Puzzle Numerical Ability

What is the common point on the graphs of y=(3/4)^x and y=(4/3)^x?

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This questions is a logarithm it is
Loga under the square root of m^6 n^13 over a^8 B^5. I know this one is simple but I am not sure what the procedure is to get the answer. Riza was 25 when her 1st son was born.Today, the sum of their ages is 105.How old is Riza and her son now?