1.
Direct Proportion:
Two quantities are said to be
directly proportional, if on the increase (or decrease) of the one, the other
increases (or decreases) to the same extent. Eg. Cost is directly proportional
to the number of articles. (More Articles, More Cost)
2.
Indirect Proportion:
Two quantities are said to be
indirectly proportional, if on the increase of the one, the orther decreases to
the same extent and vice-versa.
Eg. The time taken by a car is
covering a certain distance is inversely proportional to the speed of the car.
(More speed, Less is the time taken to cover a distance.)
Note: In solving problems by chain
rule, we compare every item with the term to be found out.
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