Only when the numbers 11 and 2 represent time in 12 hr format. Ie., 11:00 + 2:00 ==> 1:00.

2 Hours + 11 hours = 1 Hour

2 + 47 = 49, 2 x47 = 94 so the digits of the answer are the same but in reverse when you add or multiply 2 and 47. Can you find other pairs which have answers with digits reversed when added and multiplied?

Given below is a figure. You have to fill in the numbers from 1 up to 16 in such a way that you get 29 when you add the numbers in each row.