A 90 cm long wire is to be cut into two pieces so that one piece will be 2/7th of the other, how many centimeters will the shorter piece be?
Choose the correct choice from the following:
A) 73
B) 20
C) 83
D) 21
E) 52

Rationale: "explanation : 1 : 2 / 7 = 7 : 2 2 / 9 * 90 = 20 answer : option b"
Answer: B