exam Maths Puzzle Numerical Ability

A sly old fox ate 100 grapes in 5 days, each day eating 6 more than on the day before. How many did he eat on each of the 5 days?

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exam Other Question

Use the fomula 1/f=1/a+1/i to find the image distance i for an object that is 2,000,000 mm from a 250mm telephoto lens. find an equation of the line that contains the given pair of points.
(0,7) and (7,0)