Verbal Reasoning - Mental Ability Questions

In the following question, select the missing number from the given series.

57, 54, 48, 39, ?, 12

In the following question, select the related number pair from the given alternatives.

69 : 87 : : ? : ?

In the following question, select the related letter/letters from the given alternatives.

NOS : PQU : : KLP : ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

17 - 20 ÷ 25 x 6 + 10 = 12

In the following question, select the related letter/letters from the given alternatives.

KPV : LQW : : BOY : ?

Select the correct combination of mathematical signs to replace * signs and to balance the equation.

48 * 4 * 6 * 3 * 30

In the following question, select the related number from the given alternatives.

45 : 20 : : 46 : ?

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

316 + 412 - 223 - 11112 = ?