Verbal Reasoning - Mental Ability Questions

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

80 + 2 ÷ 25 + 5 - 10 = ?

In the following question, select the missing number from the given series.672, 666, 660, 654, ?

In the following question, select the number which can be placed at the sign of ? from the given alternatives.

Arrange the given words in the sequence in which they occur in the dictionary.
i. Monopoly
ii. Manifesto
iii. Manifold
iv. Mankind

The weights of 4 boxes are 30, 40, 50 and 100 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?

If 23 x 16 = 184, 37 x 10 = 185, then 85 x 12 = ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
A, C, F, H, K, ?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

d_ba_c_a_cb_