The ratio of the number of neon lamps having a life of 900 hours or mo – McqOptions

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1.	The ratio of the number of neon lamps having a life of 900 hours or more to the number of lamps having life less than 700 hours is:
A.	6 : 7
B.	7 : 8
C.	25 : 21
D.	8 : 9
Answer» E.

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