Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized for You
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Join a 4-day FREE online boot camp to kick off your GMAT preparation and get you into your dream b-school in R1.**Limited for the first 99 registrants. Register today!
The 19th of September 1987 was Saturday. What day was the 20th of September 1990 if 1988 was a leap-year?
A. Monday B. Tuesday C. Wednesday D. Thursday E. Friday
There are 365 days in an ordinary year and 366 days in a leap-year.
365 divided by 7 (a week period) yields a remainder of 1, thus the same date after an ordinary year would fall on the next day of a week;
366 divided by 7 (a week period) yields a remainder of 2, thus the same date after a leap-year would fall two days after in a week;
Thus 3 years, 1988, 1989 and 1990, will accumulate \(2+1+1=4\) days, plus 1-day difference between 19th and 20th, which gives total of 5-day difference (5-day shift). Thus, 20th of September 1990 was\(Saturday+5 days=Thursday\).
In a leap year, the Gregorian calendar adds an extra day to the shortest month of the year - February. So instead of February having 28 days as in an ordinary year, in a leap year, February has 29 days.
Thus if 19th of September 1987 was a Saturday, 19th of September 1988 would be a Monday as you add an extra day in February 1988. Using the same logic/pattern, 19th of September 1989 would be a Tuesday, 19th of September 1990 would be a Wednesday and the 20th of September 1990 would be a Thursday.
+1 for option D. As a rule, same date a year later is always a day ahead. Add to it the fact that leap year will contribute an extra day. We have a total of 4 days. Add another one day because the date is 20 September. That is 20 Sep 1990 will be a Thursday.
_________________
the same day in subsequent years is a day before except leap year that it falls in the same day as the previous year. (always ignore the i day difference between sept 19 and 20)
ordinary year (365 days) 1987 - sept 19 - saturday 1988 - sept 19 - friday (a day before) 1989 - sept 19 thursday ( a day before) 1990- sept 19 wednesday ( a day before)
leap year (assume question is same september 19 1990) 1987 - sept 19 - saturday 1988 - sept 19 - saturday (leap year) 1989 - sept 19 friday ( a day before) 1990- sept 19 thursday ( a day before)
close
40% (01:12) correct 
