A: 49mm
B: 71mm
C: 55mm
D: 60mm
E:

11 days later

Hint:
Assume the rainfall on Monday = x
Then,
rainfall on Tuesday = 2x
rainfall on Wednesday = 4x
rainfall on Thursday = 8x
rainfall on Friday = 16x
rainfall on Saturday = 8x
rainfall on Sunday = 16x
TOTAL RAINFALL = 55x

Now,
Wednesday = 4mm
4x = 4mm
x = 1 mm

Total Rainfall = 55x = 55 x 1 = 55mm

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