A) 5
B) 6
C) 7
D) None of these
Correct Answer: D
Solution :
Sol. [d] Length of plank = HCF of 42, 49 and \[63=7\] |
\[\therefore \] Number of planks \[=\frac{42}{7}+\frac{49}{7}+\frac{63}{7}\] |
\[=6+7+9=22\] |
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