Question

A camp of 700 soldiers have sufficient food for 25 days. But due to arrival of some more soldiers, the food lasted for 20 days only. How many soldiers arrived?

Answer 1

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$total \: food = 25 \times 700 \\ 25 \times 700 = (700 + x) \times 20 \\ = 700 \div 20 = 35 \\ 75 = 700 + x \\ \\ x = 175$