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05 Aug 2021, 03:45
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
86% (01:01) correct
14%
(00:44)
wrong
based on 35
sessions
History
Date
Time
Result
Not Attempted Yet
Three pieces of timber 42 m, 49 m and 63 m long have to be divided into planks of the same length. What is the greatest possible length of each plank?
(A) 7 m
(B) 14 m
(C) 21 m
(D) 42 m
(E) 63 m
(A) 7 m
(B) 14 m
(C) 21 m
(D) 42 m
(E) 63 m
05 Aug 2021, 05:14
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Greatest possible length of each plank =HCF(42,49,63)
=> 42=2×3×7
=> 49=7×7
=> 63=3×3×7
HCF (42,49,63)=7
the greatest possible length of each plank is 7 m
OA should be A
=> 42=2×3×7
=> 49=7×7
=> 63=3×3×7
HCF (42,49,63)=7
the greatest possible length of each plank is 7 m
OA should be A
