Verbal Reasoning - Mental Ability Questions

In the following question, by using which mathematical operators will the expression become correct?
15 _ 3 _ 4 _ 20

If the triangle ABC and DEF follows the given equation, then these two triangles are similar by which of the following criterion?

ABDE = BCEF =ACDF

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

9 , 21, 45, 93, ? , 381

A series is given,with one term missing. Choose amongst the given responses choose the meaningful one

206, 221, 251, 296, ?, 431

Gurpreet is facing towards south. She turns right and walks 35m, then turns right again and walks 40m more. Finally, she turns left and walks 30m. Which direction is she facing now?

In the following question, from the given alternative words, select the word which cannot be formed using the letters of the given word.
RECIPROCATE

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

42 x 7 ÷ 7 + 9 - 62 = ?

17.Rana walks 20 m straight in north direction and 20 m to the right. Then every turning to his left he walks 5, 25 and 25 metres respectively. How far is he from his starting point now?