The theory of relativity was proposed by which

There is a group of donkeys & ostriches, where the number of legs are 8 more than twice the number of tails. Find the number of donkeys in the group.

In a certain code language,

A + B means ‘A is the brother of B’.

A − B means ‘A is the father of B’.

In a certain code language,

‘M & N’ means ‘M is the wife of N’,

‘M @ N’ means ‘M is the brother of N’,

Which two numbers should be interchanged to make the given equation correct?

14 + 32 − 56 ÷ 28 × 5 = 40

Select the number from among the given options that can replace the question mark (?) in the following series. 363, 344, 325, 306, ?

Find the odd “letter group” from the given alternatives:

Which of the following letter-clusters will replace the question mark (?) in the given series?

YTM, AQQ, CNU, ?, GHC

If the image of the letter “A” is seen in a water reflection, how will it appear? 

Which of the following numbers will replace the question mark (?) in the given series?

55, 68, 82, ?, 113, 130