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What is direct proportion ? Give example.
Two quantities are said to be in direct proportion (or directly proportional), if one is a constant multiple of the other,
i.e. y is said to be directly proportional to x if y = kx where k is a constant.
                               or
If two quantities are in direct proportion, as one increases, the other increases by the same percentage.
 eg:- The amount of apples you might buy and the amount you pay for them. If you buy twice as many apples as your friend, you pay twice as much.


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