Answer:
Here, the number of days is known and rain fall is unknown. Given, rainfall in 3 days = 276 mm \[\therefore \] Rainfall in 1 day \[=\frac{276}{3}=92mm\] \[\therefore \]Rainfall in one full week i.e. 7 days \[=92\times 7=644mm\] In centimetre, rainfall in one full week \[=644\times \frac{1}{10}cm=64.4\,cm\]\[\left[ \because 1mm=\frac{1}{10}cm \right]\] Hence, 644 mm or 64.4 cm rain will fall in 7 days or one full week.
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