Maths / Direct and Inverse Variation / Time and Work

QUESTION

20 men can build a wall in nine days,then how long would it take 12 men to build the same wall?

 OPTIONS A. 12 B. 9 C. 6 D. 15
Right Option : D

EXPLANATION
Explain TypeExplanation Content
Text

$\dpi{120} \large \\According\;to\;question\\\\ Amount \;of\;wall \;built\; by\;20\;men\;in \;9\;days = 1\\\\ Amount \;of\;wall \;built\; by\;1\;man\;in \;1\;day=\frac{1}{20 X 9}\;\\\\ Amount \;of\;wall \;built\; by\;12\;men\;in \;1\;days=\frac{12}{9 X 20} = \frac{1}{15}\\\\ No\;of\;days\;=15\\\\$

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