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?  Choose the correct choice from the following choices
A) 12
B) 6
C) 88
D) 77
E) 14
1: 2/5 = 5: 2   2/7 * 21= 
<gadget id="calculator">2/7 * 21</gadget>
<output>6</output>
6   Answer: 6
<result>B</result>
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?