How to attempt weekly tests

In a class test (+ 3) marks are given for every correct answer and (–2) marks are given for every incorrect answer and no marks for not attempting any question. (i) Radhika scored 20 marks. If she has got 12 correct answers, how many questions has she attempted incorrectly? (ii) Mohini scores –5 marks in this test, though she has got 7 correct answers. How many questions has she attempted incorrectly? (iii) Rakesh scores 18 marks by attempting 16 questions. How many questions has he attempted correctly and how many has he attempted incorrectly

Kavita obtained 16, 14, 18 and 20 marks (out of 25) in Maths in weekly tests in the month of Jan 2000, then mean marks of Kavita is

Kavita obtained 16, 14, 18 and 20 marks (out of 25) in Maths in weekly tests in the month of Jan. 2000, then mean marks of Kavita is

A set of 6 questions contains true / false type questions . Maximum how many students can take the test if all the students answer different from others and must attempt all the questions ?

In a test, for each correct answer 1 mark is awarded and each wrong answer half a mark is deducted. The test has 70 questions. A candidate attempted all the questions in the test and scored 40 marks. How many question did he attempt wrongly ?

In a test, +3 marks are given for every correct answer and –1 mark are given for every incorrect answer. Sona attempted all the questions and scored +20 marks though she got 10 correct answers. How many incorrect answers has she attempted?

A test has 60 questions. For each correct answer 2 marks are awarded and each wrong answer 1 marks is deducted. A candidate attempted all the questions in the test and scored 90 marks. Find the number of questions he attempted correctly