How many days before 17th August is it, if 50 days ago, it was four times as many days since March 30th?

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18 days; 30th July. 17 August - 18 days = 20 July. 20 July - 50 days = 10 June. 10 June - 30 March = 72 days, which equals 4 x 18. QED.

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