Question

The greatest length which may be used to measure exactly ., ., 20 ft. and . is given by

A

3"

B

15"

C

18"

D

21"

Easy

Solution

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Correct option is B)



 

 

and  

In order to find the greatest length we have to find the G. C. M. of 165", 210", 240" and 255" and the G. C. M. of these four numbers is 15".

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