I am sure no one can have two things for dinner. what are they?

Prove that the below maths equation is true.

8 + 8 = 91

A man died and leaves Rs.10,000 in his will. There are 6 beneficiaries- his 3 sons and their wives. The 3 wives receive Rs.3960 of which Priyanka gets Rs.100 more than Tanu and Neha gets Rs.100 more than Priyanka.
Pramod gets twice as much as his wife, Tushar gets the same as his wife, and Prashant gets 50% more than his wife.

Who is married to whom?

Rearrange the letters in "new door" to make one word.

I know a nine-letter word having only one vowel.
Do you ?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

What number should come in place of the question mark below?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?