a, b, c are distinct numbers and the HCF of each pair of numbers (13, a), (13, b), (13, c) is 13, where a, b, c are each less than 60 and a < b < c. What is the value of \(\frac{a\;+\;c}{b}\)?
Answer & explanation
Correct answer: option 3
13, 26, 39, 52 < less than 60,
Therefore,
a = 26
b = 39
c = 52
⇒ \(\frac{a + c}{b}\) = \(\frac{78}{39}\) = 2