Find the greatest possible length which can be used to measure exactly the lengths 4 m 95 cm, 9 m and 16 m 65 cm.	Choose the correct answer.
A) 25 B) 45 C) 35 D) 15 E) 40
Required length = H.C.F. of 495 cm, 900 cm and 1665 cm.   495 = 32 x 5 x 11, 900 = 22 x 32 x 52, 1665 = 32 x 5 x 37.   Therefore, H.C.F. = 32 x 5 = 45.   Hence, required length = 45 cm.   Answer is 45.
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Find the greatest possible length which can be used to measure exactly the lengths 4 m 95 cm, 9 m and 16 m 65 cm.