The average rainfall for a week, excluding Sunday was 0.3 inches. Due to heavy rainfall on Sunday, the average for the week rises to 0.5 inch. How much rain fell on Sunday?

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Solution

Average rainfall from Monday to Saturday = 0.3 inch (i.e., for 6 days)

Total rainfall for 6 days = 0.3 inch $\times$ 6 = 1.8 inch

Average rainfall for the entire week including Sunday = 0.5 inch

Total rainfall for 7 days = 0.5 inch $\times$ 7 = 3.5 inch

Hence, rainfall on Sunday = 3.5 inch - 1.8 inch = 1.7 inch.

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