Question

Q1) If Q is directly proportional to P and Q = 28 when P = 4, (i) express Q in terms of P, (ii) find the value of Q when P = 5, (iii) calculate the value of P when Q = 42.

Answer 1

Answer: i) Q=7*P ii) if P=5 => Q=35 iii) if Q=42 => P=6

Explanation:

Q is directly prportional to P that means that

Q/P=k=const ( where k is the prportionality coefficient)

So k= 28/4=7

So i) Q= 7*P

ii) Q=5*7=35 if P=5 =>Q=35

iii) P=42/7=6 if Q=42 => P=6