exam Maths Puzzle Numerical Ability

In the figure, AB ll CE (AB is parallel to CE), AE = 12, DE= 6, and CE= 4. What is the length of AB?

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A is eleven times as old as B. in a certain number of years, A will be five times as old as B, and in five years after that she will be three times as old as B. how old are they now. Telephoto lens. Use the formula 1/F=1/O + 1/I to find the image distance I for an object that is 2,000,000 mm from 250 mm telephoto lens.