Question 319753
{{{17}}} men can dig a ditch 26m long in 18 days , working 8 hours a day.
{{{17*8 = 136}}} men can dig a ditch 26m long in 18 days , working 1 hour a day
{{{136/2 = 68}}} men can dig a ditch 13m long in 18 days , working 1 hour a day
{{{3*68 = 204}}} men can dig a ditch 13m long in 6 days , working 1 hour a day
{{{3*204 = 612}}} men can dig a ditch 39m long in 6 days , working 1 hour a day
{{{612/9 = 68}}} men can dig a ditch 39m long in 6 days , working 9 hours a day
{{{68 - 17 = 51}}}
It will take 51 more men