Three pieces of timber 24 m, 28 m and 36 m long have to be divided into planks of the same length, What is the greatest possible length of each plank ? Pick one.
A) 7 m B) 4 m C) 42 m D) 63 m E) None of these
Answer   Greatest possible length of each plank = H.C.F of 24, 28, 36 = 4 m   Correct Option: 4 m
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Three pieces of timber 24 m, 28 m and 36 m long have to be divided into planks of the same length, What is the greatest possible length of each plank ?