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If 24th July, 1979 is a Tuesday, then which of the following days is a Tuesday ?

  • A.21st July, 1980
  • B.22nd July, 1980
  • C.23rd July, 1980
  • D.24th July, 1980

Answer: B

The Tuesday is 22nd July, 1980.

From 24 July 1979 to 24 July 1980 is one year that includes 29 February 1980, so it has 366 days:

\[ 366 = 52 \times 7 + 2 \]

The weekday therefore moves forward by 2 days: 24 July 1980 falls on Thursday. Counting back, 23 July 1980 is Wednesday and 22 July 1980 is Tuesday.

24 July 1980 would be a Tuesday only if the year had exactly 52 weeks, ignoring the extra days. 23 July would follow from adding just one odd day, as for a non-leap year.

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