Question

If every month would have been of 30 days
and 1st Jan 1 A.D was Monday, what day was
on 1st March 2009?
Sunday
Tuesday
Wednesday
Saturday
Clear​

Answer 1

Answer:

answer should be sunday i guess...

Answer 2

Given,

The number of days in every month = 30

The day of the week on 1st January 1 A.D. was Monday.

To Find,

The day of the week on 1st March 2009.

Solution,

The number of years between 1st January 1 A.D. and 1st January 2009 = 2009

Number of months between 1st January 1 A.D. and 1st January 2009 =

$2009$×$12$ (since each year has 12 months)

⇒24108 months.

Number of days between 1st January 1 A.D. and 1st January 2009 =

$24108$×$30$( since each month has 30 days)

⇒723240days

The number of days between 1st January 2009 and 1st March 2009 =

$3$×$30$ (since there are three months and each month has 30 days)

⇒90 days

∴Total number of days between 1st January 1 A.D. and 1st March 2009 = $723240+90$

⇒723330 days

Number of weeks in 723330 days = $\frac{723330}{7}$

⇒103332 weeks + 6 days.

6th day after Monday is Sunday.

Henceforth, 1st March 2009 was Sunday. So option (a) is correct.