Question

Q is directly proportional to r.
Q is 76 when r is 20.
Work out q when r is 45

Answer 1

171

Explanation:

Q~r

find k (k is the constant)

Q=kr

76=k×20

76=20k divide 20 on both sides giving you

k=3.8

then Q=k×r

Q=3.8×45

Q=171