1: 2/5 = 5: 2
2/7 * 21 = 6
This justifies what answer for what question? Q & A: 
user
A 21 cm long wire is to be cut into two pieces so that one piece will be 2/5th of the other, how many centimeters will the shorter piece be?
Options:
(A) 12
(B) 6
(C) 88
(D) 77
(E) 14
(B)
assistant