Two quantities are said to be inversely proportional to an increase (decrease) in one quantity correspondence to a constant decrease (increase) in the other quantity. A can do a piece of work in 25 days and B alone can be the same work in 20 days. Read the above information and answer the following questions: (i)1 day work of A+B is
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If two quantities x and y vary (change) together in such a manner that the ratio of their corresponding values remains constant, then x and y are said to be in direct proportion.
• if two quantities x and y vary (change) in such a manner that an increase in x causes a proportional decrease in y (and vice versa), then x and y are said to be inverse proportion.
• If x and y are in a direct proportion, then
• If x and y are in an inverse variation, then xy = constant.
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