Question

how many soldiers left the fort

Answer 1

150 soldiers are sent

Answer 2

$total \: day \: for \: 1 \: soldier \: food = 1200 \times 28 \\ \\ \: \: \: \: \: \: \: \: \: \: \: = 1200 \times 28 = 33600 \\ \\ after \: 4 \: day \: left \: food = 33600 - (1200 \times 4) \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 33600 - 4800 = 28800 \\ \\ \: \frac{28800}{32} = 900 \\ \\ \\ \\ 900 \: soldiers \: are \: in \: fort \\ \\ 1200 - 900 = 300 \\ \\ 300 \: soldiers \: are \: left \: in \: fort$