The length of the longest tape in cm which can be used to measure exactly, the length 100cm; 2m25cm; and 7m80cm is: Select the correct option:
A) 30	B) 5	C) 10	D) 36	E) 25
The three lengths in cm are 100, 225 &amp;780.   HCF of 100, 225 &amp;780 is 5.   Hence, the answer is 5 cm.   ANSWER:5
<result>B</result>
The length of the longest tape in cm which can be used to measure exactly, the length 100cm; 2m25cm; and 7m80cm is: