Question : In a team of 10 persons, nine spent Rs. 40 each for their meal, and the remaining one spent Rs. 9 more than the average expenditure of all the 10 persons. The total expenditure for their meal was:
Option 1: Rs. 510
Option 2: Rs. 310
Option 3: Rs. 410
Option 4: Rs. 610
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Correct Answer: Rs. 410
Solution : Let the total expenditure for their meal be Rs. $x$. According to the question: $x = 9×40+(9+\frac{x}{10})$ ⇒ $x = 360+9+\frac{x}{10}$ ⇒ $x-\frac{x}{10} = 369$ ⇒ $\frac{9x}{10} = 369$ $\therefore x = 410$ Hence, the correct answer is Rs. 410.
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