Bunuel
Anna and John visit Central Park every 2 and 3 days, respectively. They first met today, which was a Thursday. They agreed that each time they meet on a Sunday, John will invite Anna for coffee. In how many days from today will Anna receive her second coffee invite from John?
A. 6 days
B. 12 days
C. 24 days
D. 42 days
E. 66 days
Anna and John meet after every 6 days. We arrived at the value 6 by taking the LCM of 2 and 3.
6 days from Thursday = Wednesday ⇒
Inference: We are moving back by a day, i.e. Wednesday = Thursday - 1 dayTo understand this further, let's take another cycle
6 days from Wednesday = Tuesday
(Tuesday = Wednesday - 1 day)So for the
first coffee invite, Anna and John have to meet \(4\) times (as we need to move back \(4\) days from Thursday to reach a Sunday). Each interval has a gap of \(6\) days so the total number of days for the
first coffee invite = \(6 * 4 = 24\) days.
For the
second coffee invite, the time interval is \(7\) days, i.e. Anna and John have to meet \(6\) times so that when they meet the \(7^{\text{th}}\) time, the day is a Sunday. Each interval has a gap of \(6\) days so the total number of days between the first and the second coffee invite = \(6 * 7 = 42\) days.
Total number of days = \(42 + 24 = 66\) days.
Option E