exam Maths Puzzle Numerical Ability

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.

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9 radical 7 - 4 radical 2 + 3 radical 2 + 5 radical 7 suppose tht 12 dimes and nickels are worth 95 cents . how many dimes and nickels are there??