Ratio and proportion
215:474::537:?
Pick one
A) 26  B) 27  C) 25  D) 22  E) 23

Rationale: 2 + 1 + 5 + 4 + 7 + 4 = 23 5 + 3 + 7 + x = 23 = > x = 8 combination that match 8 is 26 since 2 + 6 = 8 answer : a
Answer: A