A person on tour has Rs. 4200 for his expenses. If he extends his tour for 3 days, he has to cut down his daily expenses by Rs. 70. Find the original duration of the tour.

Explanation

To solve the problem, we will follow these steps:

### Step 1: Define the Variables
Let the original duration of the tour be \( x \) days.

### Step 2: Set Up the Equation for Daily Expenses
The total amount available for expenses is Rs. 4200. Therefore, the daily expenses for the original duration can be expressed as:
\[
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