Question

hundred soldier in Fort had enough food for 20 days some soldiers were shifted to another for due to which food lasted for 25 days how many soldiers shifted

Answer 1

let the remaining soldiers be X. Then
$20 \times 100 = 25 \times x \\ x = \frac{20 \times 100}{25} = 80$
therefore number of soldiers shifted is
$100 - 80 = 20$