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})