Question 850440
Let {{{ R }}} = the rate that a man works
{{{ (2/3)*R }}} = the rate that a woman works
{{{ (4/3)*R }}} = the rate that 2 women work
{{{ (1/3)*R }}} = the rate that a child works
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{{{ R = 1/3 }}} ( 1 acre of weeding ) / ( 3 days )
{{{ (4/3)*R + (1/3)*R }}} = rate of 2 women + 1 child
{{{ (4/3)*(1/3) + (1/3)*(1/3) = 4/9 + 1/9 }}}
{{{ 4/9 + 1/9 = 5/9 }}}
{{{ 5/9 = (( 5/3 )) / 3 }}}
They can weed 1 and 2/3 acres in 3 days