A) 57
B) 65
C) 75
D) 45
Correct Answer: A
Solution :
\[A:B:C=\frac{1}{3}:\frac{1}{4}:\frac{1}{5}:\frac{1}{6}\] \[=\frac{1}{3}\times 60:\frac{1}{4}\times 60:\frac{1}{5}\times 60:\frac{1}{6}\times 60\] [LCM of\[3.4.5\,\,\,\And \,\,6=60\]] \[=20:15:12:10\] \[\therefore \] Minimum number of pens \[=20+15+12+10=57\]You need to login to perform this action.
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