Ram was married on Tuesday 2010. When will he celebrate his next wedding anniversary on same day?

2021

Divide last 2 digit by 4 and if Remainder

1  →   Calendar repeat after 6 years

2  →   Calendar repeat after 11 years

3  →   Calendar repeat after 11 years

0  →   Calendar repeat after 28 years

2010    divide 10 by 4  =  10/4  =  Remainder 2

Remainder is 2, so calendar repeat after 11 years i.e. 2021 .