Choose the correct alternative that will replace the question mark in the given series

DHL, PTX, BFJ, ?

Find the wrong number in the series 28, 33, 31, 36, 34, 29

The age of Rakhi is twelve times that of her daughter Anubha. If age of Anubha is 3 years now, then what was the age of Rakhi, 2 years earlier?

From the given words, select the word which can be formed using the letters of the given word.
AMPLIFICATION

If BLACKSMITH is coded as CNBELUNKUJ, then CHILDREN will be coded as ?

If 17 + 17 = 2895 18 + 18 = 3245 19 + 19 = 3615 then 23 + 23 = ?

In the following problem, '=' stands for '÷' , '+' stands for '­' , 'x' stands for '=', '­' stands for '+' and '÷' stands for 'x'. Find the correct equation.

Select the missing number from the given responses.