In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.

462 = 551
398 = 487
856 = ?

If A denotes '+', B denotes '­', C denotes 'x' and D denotes '÷', then which of the following statement is true?

In a certain code GIVE is written as VIEG and OVER is written as EVRO. How will DISK be written in that code?

From the given alternative words, select the word which cannot be formed using the letters of the given word:

ENDEAVOUR

Gopal is older than Mohan but younger than Ram. Mohan is older than Sohan but younger than Ram. Who is the oldest?

A prime number between 10 and 50 remains unchanged if its digits are reversed. Then the square of such a number is:

In the following question, one term in the number series is wrong. Find out the wrong term?

5, 10, 40, 80, 320, 550, 2560

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

BCF, CFI, DHL, ?