Mathematics

W is directly proportional to U. If W = 5 when U = 3, find when…

W is directly proportional to U. If W = 5 when U = 3, find when W = 2/7

  • A.6/35
  • B.10/21
  • C.21/10
  • D.35/6
Correct Answer: Option A
Explanation

(W ∝ U\
W = KU\
K = frac{W}{U}\
K = frac{5}{3}\
W = frac{5}{3}U\
frac{2}{7} = frac{5}{3}U\
U = frac{2}{7} times frac{3}{5}\
U = frac{6}{35})