The average rainfall from Monday to Saturday is 0.6 inches, but the average for the whole week is 0.5 inches. What was the rainfall on Sunday?

Taking the numbers literally: total for Mon–Sat (6 days) = 0.6×6 = 3.6; total for the week (7 days) = 0.5×7 = 3.5; Sunday's rainfall = 3.5 − 3.6 = −0.1, which is physically impossible (rainfall can't be negative) — confirming the flagged inconsistency. This exact question is a corrupted variant of a well-known aptitude problem where the Mon–Sat average is 0.3 (not 0.6) inches: total Mon–Sat = 0.3×6 = 1.8, total week = 0.5×7 = 3.5, so Sunday's rainfall = 3.5 − 1.8 = 1.7 inches — a positive, sensible answer that is also one of the four listed options. This strongly suggests the '0.6' in the question stem is a transcription error for '0.3', and the intended/correct answer is 1.7, not the DB's 0.1 (which is merely the absolute value of an impossible negative result).

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• Wrong explanation