Multiple choice general knowledge math & puzzles If a:b=c:d Then, (pa+qc)/(pb+qd) will be p:q a:b c:d a:b and c:d Reveal answer Fill a bubble to check yourself D Correct answer Explanation If a:b = c:d = k, then a = bk and c = dk. Substituting: (pa+qc)/(pb+qd) = (pbk+qdk)/(pb+qd) = k(pb+qd)/(pb+qd) = k = a/b = c/d. Since a:b = c:d by given condition, the expression equals both ratios.