Calendar concept ..

- mathslover

Calendar concept ..

- Stacey Warren - Expert brainly.com

Hey! We 've verified this expert answer for you, click below to unlock the details :)

- jamiebookeater

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

- mathslover

@annas and @angela210793

- mathslover

for example : november 9 , 1991

- mathslover

1990 = 1600 + 300 + 0

Looking for something else?

Not the answer you are looking for? Search for more explanations.

## More answers

- mathslover

odd days in 1600 = 0 and in 300 = 1 .. hence we get total odd days in 1900 = 1

- mathslover

now calculate the total number of days from 1.1.1991 to 9.11.1991

- mathslover

since 1991 is not a leap year hence we have days in february = 28
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 9 = 313
divide that by 7
we get remainder = 5
hence total number of odd days = 1 + 5 = 6

- mathslover

Monday Tuesday Wednesday Thursday Friday Saturday Sunday
1 2 3 4 5 6 7
total number of odd days = 6
hence on 9 november 1991 it was saturday

- mathslover

@annas right?

- angela210793

Very niice :D

- mathslover

yes it is a very nice process also

- mathslover

useful process

- anonymous

O.o i m shocked ... but awesome

- mathslover

:) thanks

- anonymous

we can make a computer program on that

- anonymous

logic

- mathslover

yes .. can u?

- anonymous

i can try , i have to make an algorithm on that first. i'll try as soon as my website work is done

- mathslover

oh k

- anonymous

but i didnt get.......

- mathslover

what is ur date of birth .. i will take urs as an example

- anonymous

15 july 1992

- mathslover

ok so first of all :
1992 = 1600 + 300 + 2 right?

- anonymous

wait always we have to break into 1600 +........so on

- mathslover

yes it becomes easy

- mathslover

wait we will take 1991 here:
1991 = 1600+300+1
1600 = 0 odd days
300 = 1 odd day
1 = 1 odd day
now calculate the number of days from 1.1.1992 to 15.07.1992
31+29+31+30+31+30+15 = 197
divide 197 by 7
remainder = 1
hence total number of odd days = 1 + 1 + 1 = 3

- mathslover

hence the day on 15 july 1992 = wednesday

- mathslover

got it ? @nitz

- anonymous

wait...

- anonymous

300........1 odd day??

- mathslover

yes

- mathslover

Number of odd days in 300 years = (5 x 3) =15/7 = remainder = 1 odd day.

- mathslover

we can write 300 = (100)*3
number of odd days in 100 = 5 and hence in 300 it will be 5*3 = 15 / 7 remainder = 1

- mathslover

got it?

- mathslover

100 years = 76 ordinary years + 24 leap years
= (76 x 1 + 24 x 2) odd days = 124 odd days.
= (17 weeks + days) 5 odd days.
Number of odd days in 100 years = 5.

- anonymous

leave it ........i am getting confused
anyways thank you,,,,,,,

- mathslover

http://www.indiabix.com/aptitude/calendar/formulas

- mathslover

this is a confusing topic
no problem

- anonymous

i learnt some simple tricks like 85^2,125^2......

- mathslover

85^2 = (90-5)^2 = 8100+25-900 = 8125-900 = 7225

- mathslover

well wait lemme show u the shortcut one also

- anonymous

\[85^{2}=?\]
firstly mutiply last two :5*5=25
then multiply first digit that is 8*9=72
so 7225

- mathslover

:D right

- anonymous

i have multiplied first digit with a digit exceeding it....8*9=72

- mathslover

125^2 = 5^2
12*13=156
15625 = 125^2

- anonymous

ya....

- anonymous

even for 11....
say 49*11 we have
9 as it is
4+9=13
i carry off and4+1=5
so 539

- lgbasallote

...i dont get it...

- mathslover

should i give u another example?

- mathslover

@lgbasallote so lemme take this as an example :
what is the day on 06-8-2012 ?
ok?

- lgbasallote

yeah sure

- mathslover

ok so 2011 = 1600 + 300 + 111 right ?

- lgbasallote

but you're looking for 2012...

- mathslover

yes but we will calculate odd days in 2011 years and then from 01-08-2012 to 06-08-2012

- mathslover

since 2012 is not a complete year hence we are taking 2011 there. . ok?

- lgbasallote

go on

- mathslover

wait i am making it soo long sorry

- mathslover

ok so .. 2011 = 1600 + 300 + 100+10+1
odd days in 1600 = 0 , in 300 = 1 and in 111= 5
now : count the total number of days from 1.1.2012 to 6.8.2012 :
31+29+31+30+31+30+31+6 = 219
divide 219 by 7 : we get remainder as 2
hence total number of odd days : 5 + 1 + 2 = 6 + 2 = 8
now : 8 days / 7 = remainder = 1
hence finally 1 odd day that denotes that the day on 06.08.2012 is monday
monday

- mathslover

Made it short :D ..
well do you know the exact meaning of odd days?

- mathslover

well do you know understand what this concept is?
any more questions

- lgbasallote

what do you mean 0 odd days in 1600; 1 in 300 and 5 in 111

- mathslover

hint :
1 ordinary year = 52 weeks + 1 day
hence that 1 day is odd day =1

- anonymous

@mathslover can u expl this to me

- mathslover

No problem what is ur date of birth ?

- mathslover

ok . so
1995 = 1600 + 300 + 5
right?

- mathslover

oops wait it is :
1995 = 1600 + 300 + 95 right?

- anonymous

it is 1996

- mathslover

1996 is not a full year .. hence we will take 1995 there .. ok?

- anonymous

wat do u mean by full year

- anonymous

wat do u mean by full year

- anonymous

@mathslover

- mathslover

full year means that : 365 days
in 1996 you dont have 365 days as ur birthday is on 11 - 03 .. got it?

- anonymous

ok

- mathslover

now
no. of odd days in 1600 =0 in 300 = 1 and in 95 =6
count days from 1.1.1996 to 11.03.1996
31+29+11 = 71
71/7 = remainder = 1
total odd days = 6+1+1 = 8
hence on 11.03.1996 it was monday

- mathslover

95/4 = 23 ..
hence 95 years = 23 leap years + 72 ordinary years
odd days in 95 years = 23*2 + 72*1=46+72 = 118
118/7 = remainder = 6

- mathslover

got it @Yahoo! ?

- anonymous

u r correct....

- mathslover

thanks

- anonymous

@mathslover Any video on this topic

- mathslover

well not yet but lemme check it

- mathslover

sorry no .. @Yahoo!
http://www.indiabix.com/aptitude/calendar/
prefer this

- mathslover

good question :
for example :
1 ordinary year has 365 days
there are totally 52 weeks and 1 day ..
that 1 day is called odd day

- anonymous

Can you explain why the mayan calendar says the world is going to end this year?

- mathslover

well that are superstitions , only mayan calendar can explain sorry

- ParthKohli

@RyanL. It has been assumed that the world will end just because 2012 is the last year mentioned in Mayan Calendar.

Looking for something else?

Not the answer you are looking for? Search for more explanations.