Question 64
A camp of 250 soldiers has food for 600 days. After 60 days, 50 soldiers leave the camp. For how many days will the remaining food last from the time that these 50 soldiers left?
Solution
Let's assume the remaining food last from the time that these 50 soldiers left is 'y' days.
$$men_1\times\ days_1\ =\ men_2\times\ days_2$$
$$250\times600\ =\ 250\times60+\left(250-50\right)\times y$$
$$250\times600\ =\ 250\times60+200\times y$$
$$250\times3\ =\ 25\times3+y$$$$750\ =\ 75+y$$
y = 750-75
= 675
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