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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
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1982 -Friday
1983 -Fd+1=Sat
84+1=Sun
85+1=mon
86+1=tue
87+1=wed
1987 wed+1=Thursday
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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
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June 25, 1987

The following is a formula/mathematical approach to solving this type of question. It is kind of cumbersome; but once acquainted, you can easily solve these types of questions.

year 1600-> 0 odd days
In every 100 years, there are 5 odd days
+300-> 5*3 = 15 odd days = 15%7= 1 odd day

Upto 1900-> 1 odd day

Upto 1986:
86/4 = 21 leap years
86-21=65 ordinary years

Every leap year: 2 odd days,
ordinary year: 1 odd day
So; 21*2+65 = 42+65=107 odd days = 107%7 = 2 odd days

So; from 1600-1986 end = 1+2 = 3 odd days

in 1987(non-leap year)
Jan=31; Feb=28; March=31; April: 30 May:31 June: 25
31+28+31+30+31+25 = 176%7 = 1 odd day

Total: 3+1=4 odd days

odd days-day
0-Sunday
1-Monday
2-Tuesday
3-Wednesday
4-Thursday
5-Friday
6-Saturday

Ans: Thursday

*****************************
June 25, 1982, fell on a Friday. On which day of the week did June 25, 1987, fall?

june 25,1983: Saturday
june 25,1984: Monday (Leap year: Feb would be 29 days- so days 2+)
june 25,1985: Tuesday
june 25,1986: Wednesday
june 25,1987: Thursday
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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
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banksy wrote:
June 25, 1982, fell on a Friday. On which day of the week did June 25, 1987, fall? (Note: 1984 was a leap year.)

A. Sunday
B. Monday
C. Tuesday
D. Wednesday
E. Thursday


Similar question to practice: the-19th-of-september-1987-was-a-saturday-if-1988-was-a-126468.html
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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
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I set this up like a remainder problem. There are 5 years between 6/25/1982 and 6/25/1987...

365 * 5 = 1825
Add one day for leap year = 1825+1 = 1826
Divide 1826 days by 7 = 7/18 = 2, 7/42 = 6, 7/6 0 remainder 6 days.

So since the remainder is 6 days, the answer is one day less than Friday, which is Thursday.
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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
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banksy wrote:
June 25, 1982, fell on a Friday. On which day of the week did June 25, 1987, fall? (Note: 1984 was a leap year.)

A. Sunday
B. Monday
C. Tuesday
D. Wednesday
E. Thursday


Total years = 5
Total days = 5 *365 + 1 (for leap year) = 1826
1826/7 gives a remainder of 6.

Therefore, Friday + 6 days = Thursday
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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
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banksy wrote:
June 25, 1982, fell on a Friday. On which day of the week did June 25, 1987, fall? (Note: 1984 was a leap year.)

A. Sunday
B. Monday
C. Tuesday
D. Wednesday
E. Thursday

Solution:

Since June 25, 1987, is exactly 5 years after June 25, 1982, including the 1 extra leap day in 1984, we see that 5 x 365 + 1 = 1826 days have elapsed between the two dates. Since 1826/7 = 260 R 6, we see that 260 weeks and 6 days have elapsed between the two dates. Since June 25, 1982, fell on a Friday, then June 25, 1987, would be 6 days after Friday; hence, June 25, 1987, fell on a Thursday.

Answer: E
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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
MHIKER wrote:
1982 -Friday
1983 -Fd+1=Sat
84+1=Sun
85+1=mon
86+1=tue
87+1=wed
1987 wed+1=Thursday

Hi buddy
You did a mistake by counting year '87 twice. You should add the extra 1 in '84 for it's a leap year.

Posted from my mobile device
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Re: June 25, 1982, fell on a Friday. On which day of the week did June 25 [#permalink]
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