Question 199674
Four men can dig a 40 foot well in 4 days.
 How long would it take for 8 men to dig a 60 foot well? 
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Find how many man-days required to dig a 40 ft well:
4 * 4 = 16 man-days
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Let x = no. of days to dig the 60 ft well
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Use a ratio equation:
{{{(8x)/16}}} = {{{60/40}}}
Simplify
{{{(x)/2}}} = {{{60/40}}}
Cross multiply
40x = 2*60
40x = {{{120/40}}}
x = 3 days, 8 men dig a 60 ft well
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