There were 1600 soldiers in a fort. They had provisions to last for 32 days. After 4 days, some soldiers left the fort and the balance food lasted for 35 days more. Find the number of soldiers who left the fort.
- number of soldiers=1600,1600-x
- no. of days=28,35
this is a case of inverse proportion
=1600*28=(1600-x)35
=1280=1600-x
x=1600-1280
x=320 soldiers had left the fort