Answer :

Given: Number of people living off the food stock for 70 days = 500

To find: Number of days the stock will last if 700 people live off.

Formula:

Substituting x_{1} = 500, y_{1} = 70 x_{2} = 700 in the formula,

Gives y_{2} =

∴If 200 more people join, the food will last for 50 days.

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