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Directly proportional: as one amount increases, 
another amount increases at the same rate.
The symbol for "directly proportional" is 
Example: you are paid $20 an hour How much you earn is directly proportional to how many hours you work Work more hours, get more pay; in direct proportion.
The constant of proportionality is 20 because:Earnings = 20 × Hours worked
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do u know what is inverse proportion?
Inverse Proportion:
Suppose that 20 men build a house in 6-days. If men are increased to 30 then they take 4-days to build the same house. If men become 40, they take 2-days to build the house.


It can be seen that as the no. of men is increased, the time taken to build the house is decreased in the same ratio.
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ur wlcm