If 400 soldiers eat 20 tonnes of food in 100 days, how much will 40 soldiers eat in 20 days?
Explanation:
Let amount of food consumed by each soldier per day = x kg
The amount of food consumed by 400 soldiers in 100 days = x × 400 × 100 ⇒ 40000x = 20 × 1000 kgs
x = 0.5 kg/day
Now, amount of food consumed by 40 soldiers in 20 days = 0.5 × 40 × 20 = 400 kgs.
Hence, option (b).
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