Question
A coder solved problems at an average of x problems per
day for the first 25 days. In the next 5 days, they solved at an average of 64 problems per day, which increased the overall average by 4. What was the average for the first 25 days?Solution
Let, average problems per day in first 25 days is x So, (25 × x + 5 × 64)/30 = x + 4 Or, 25x + 320 = 30x + 120 Or, 5x = 200 Or, x = 40
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