P is directly proportional to Q and Q = 7 when P = 15. Find P when Q = 14.

10 20 30 22

30

P is directly proportional to Q So, P = c . Q    ( c = constant ) 15 = c . 7 c = \(\frac{15}{7}\) Now, When Q = 14 P = c . 14 = \(\frac{15}{7}\) × 14 = 30