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during a period of x weeks, there were 13 days when it didn't rain. on how many days did it rain?

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in x weeks there are 7 x days
so
7 x - 13

Please work it out

13×x=13x

7x -13

In 1 week=7 days
X weeks= 7x days
Number of days it rained is 13
Number of days it didn't rain = 7x - 13

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