Question
In a college of 35 students, the
average speed of typing in an English class is 50 words per minute, but after one student left and 7 new students joined, the average typing speed became 49.5 words per minute. What is the typing speed of a student who types 5 words per minute faster than the student who left, if the total typing speed of the seven new students is 320 words per minute?Solution
ATQ, Total typing speed of class = 35 * 50 = 1750 1750 - x + 320 = 49.5 * 41 2070 - x = 2029.5 x = 40.5 Required typing speed = 40.5 + 5 = 45.5 words per minute
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