CHAIN RULE
1.DIRECT PROPORTION: Two Quantities are said to be directly proportional,
if on the increase (or decrease) of th one, the other increases(or decreases)
to the same extent.
Ex:(i) Cost is directly proportional to the number of articles.(More articles,
More cost).
(ii)Work done is directly proportional to the number of men working on it.
(More men, more work).
2.INDIRECT PROPORTION: Two Quantities are said to be indirectly
proportional,if on the increase of the one , the other decreases to the same
extent and vice-versa.
Ex:(i) The time taken by a car covering a certain distance is inversely
proportional to th speed of the car.(More speed, less is the time taken
to cover the distance).
(ii)Time taken to finish a work is inversely proportional to the number
of persons working at it.
(More persons, less is the time taken to finish a job).
NOTE: In solving Questions by chain rule, we compare every item with the
term to be found out.
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