• # question_answer In a camp there is sufficient food for 105 soldiers for 21 days. If 42 soldiers leave the camp, how long would the food last? A)  30                  B)         35      C)  65                  D)         45

It is a case of inverse proportion. Hence, $105\times 21=63\times y$ Or $y=\frac{105\times 21}{60}=35$