Question 968164
4 men can dig a piece of land in 8 hours,how many men should be added to dig the same piece of land in 2 hours?
<pre>
{{{matrix(1,2,LESS,MEN)/matrix(1,2,MORE,MEN)}}}{{{""=""}}}{{{matrix(1,2,LESS,HOURS)/matrix(1,2,MORE,HOURS)}}}

{{{matrix(1,2,4,MEN)/matrix(1,2,4+x,MEN)}}}{{{""=""}}}{{{matrix(1,2,2,HOURS)/matrix(1,2,8,HOURS)}}}

{{{4/(4+x)}}}{{{""=""}}}{{{2/8}}}

Cross-multiply:

32 = 2(4+x)
32 = 8+2x
24 = 2x
12 = x

Edwin</pre>