Question
A girl was asked to determine 4/7 of a number. By mistake she worked out 5/7 of the number. Her answer was 84 more than what it should have been. Find the number.
Solution
ATQ, Let the number = x Wrong answer − Correct answer = 84 x × 5/7 − x × 4/7 = 84 (5/7 − 4/7) x = 84 (1/7) x = 84 x = 84 × 7 = 588 So, the number = 588.
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