Because 4 6 9 1 1 these four months are all 30 days.

So 30-20 =1010+1=1.

That is to say, there are 1 1 day from April 20th to May.

Because April 20th is Saturday, and there are seven days in a week.

1 1÷7= 1 Yu 4

So it's equivalent to four days on Saturday.

So the answer is Wednesday.

Do not ask questions! ! ! !