What value should come in place of the question mark (?) in the following question?

52x14+145018=1998÷?

Aniruddh's birthday is on Sunday 2nd April. On what day of the week will be Priyansh's Birthday in the same year if Priyansh was born on 28th October?

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

-7.5, 15, -30, 60, ? , 240

If a, b and c are positive integers such that 1a+1b+1c+12 = 1623, then what is the mean of a, b and c?

For any two real numbers a and b.

a-b2+b-a2 is

Suppose n is a positive integer such that (n2+ 48) is a perfect square. What is the number of such n?

The expression 52n –23n has a factor?

In an examination, 52% candidates failed in English and 42% failed in Mathematics. If 17% failed in both the subjects, then what percent passed in both the subjects?

A boat is sailing towards a lighthouse of height 20√3 m at a certain speed. The angle of elevation of the top of the lighthouse changes from 30° to 60° in 10 seconds. What is the time taken (in seconds) by the boat to reach the lighthouse from its initial position?