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P varies directly with Q and inversely with R.
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P=18 when Q=6 and R=2. What is P when Q=20 and R=10?

Sagot :

waratbelca
P varies directly with Q and inversely with R, on the contrary, P varies inversely with R, this means P and R are indirectly proportional. In simple terms it means whatever you do to P, you do the opposite to R. Or P=K*Q/R

18=k*5/2 
18=5k/2 
5k=36 
k=36/5 

P=K*Q/R 
p=(36/5)(20/10) 
p=72/5 
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