Question
An athlete ran a certain average distance for 10 days.
For the next 10 days, he ran 72 km per day, increasing his overall average by 6 km. What was his average distance in the first 10 days?Solution
Let, average distance in first 10 days is x So, (10 × x + 10 × 72)/20 = x + 6 Or, 10x + 720 = 20x + 120 Or, 10x = 600 Or, x = 60
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