What day of the week is the first day of the month?

The last Friday of a particular month is on the 25th day of the month. What day of the week is the first day of the month?

Counting back from 25th day, the multiple of 7 is 21'st day which will also be a Friday. i.e; 25-21= 4th day of the month.

If 4th day is a Friday, then first day of month will be Tuesday.

The first day of the month is a Tuesday.

What day of the week was yesterday?

Suppose five days before the day after tomorrow was Wednesday. What day of the week was yesterday?

Refer to the diagram below:

Yesterday was two days from Wednesday, so Friday.

Yesterday was Friday.

What day of the week will it be?

Suppose today is Tuesday. What day of the week will it be 100 days from now?

MetroEye: A week comprises of 7 days. Hence multiples of 7 will be the same day of the week i.e; 7th, 14th, 21st etc days will be the same day.

If today is Tuesday, then 7th, 14th, 21st.... etc will be Tuesdays. 

So multiple of 7 less than 100 is 98, => 98th day will also be a Tuesday.

100th day from today will be then 2 days from Tuesday which is Thursday.

So 100 days from now will be Thursday.