The length of the longest tape in cm which can be used to measure exactly, the length 6m; 5m ; and 12m is:
Answers.
A) 200 B) 100 C) 50 D) 1200 E) 500

Rationale: the three lengths in cm are 600,500 & 1200 . hcf of 600 , 500 & 1200 is 100 hence , the answer is 100 cm . answer : b
Answer: B