exam Maths Puzzle Numerical Ability

The age of Mary and Claire are in the ratio 5:7. Four years later their age will be in the ratio 3:4. Find their ages . please help me with this sum i am kind of getting confused and thanks!

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could use some help with this please! solve the equation
4(2x-4)-2=4(x-3)+(2) Thanks! a bacteria culture started with a count of 480 at 8am and after t hrs is expected to grow to f(t)=480(3/2)t. estimate the number of bacteria in the culture at noon the same day