What is the primary goal of

Which two numbers should be interchanged to make the given equation correct?

15 × 20 + 30 ÷ 10 – 12 = 163

Read the given statements and conclusions carefully. Decide which of the given conclusions is/are true based on the statements

Statements:

B's mother is the daughter of F. C is the son of F and D. G is the son of C and E. D is the mother of R. How is F related to G?

Select the number from among the given options that can replace the question mark (?) in the following series.

48, 75, 108, ?, 192

Select the number from the given options which can come in place of the question mark (?) in the following equation. 

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter-cluster.

Select the correct mirror image of the given figure when the mirror is placed to the right side of the figure.