P varies directly as Q and inversely as R. When Q = 36 and R = 16, P = 27. Find the relation between P, Q and R.
- \(P = \frac{Q}{12R}\)
-
\(P = \frac{12Q}{R}\)
- \(P = 12QR\)
- \(P = \frac{12}{QR}\)
The correct answer is: B
Explanation
\(P \propto \frac{Q}{R}\)\(P = K \frac{Q}{R}\)
When Q = 36, R = 16, P = 27
Then substitute into the equation
\(27 = K \frac{36}{16}\)
\(K = \frac{27 \times 16}{36}\)
\(K = 12\)
So the equation connecting P, Q and R is
\(P = \frac{12Q}{R}\)
There is an explanation video available .