Question

In a meadow there is sufficient grass for feeding 10 buffaloes or 12 cows for a period of 140 days. For how many days will 20 buffaloes and 18 cows feed on the quantity of grass?

Answer 1

10B=12C,
5B=6C,

Ratio of eating capacity
B:C=6:5,

20B+18C=4×5B+18C=4×6C+6C=30C,

then total days=12×140/30=56 days