A garrison is provided with ration for 90 soldiers to last for 70 days. For how much more time would the whole ration last if 10 additional soldiers join them after 20 days?
40 days
36 days
45 days
30 days
Explanation:
Let the whole ration now lasts for x days.
Equating the consumption on both sides, we get (90 × 70) = (90 × 20) + (100 × x) ⇒ x = 45 days.