`10` kg of water at `30°C` is heated to its boiling point on a stove that uses LPG as fuel. If the efficiency of the

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Q 3160291115.     `10` kg of water at `30°C` is heated to its boiling point
on a stove that uses LPG as fuel. If the efficiency of
the stove is `70%,` then find the mass of the fuel that is
consumed. Take the calorific value of LPG (Butane)
as `55,000 k J kg^(- 1)` .

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