31-03-2015
Mathematics

Answered

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

Answer :

waratbelca waratbelca

31-03-2015

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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