2 marks question

In an examination,a student attempted 15 questions correctly and secured 40 marks.If there were two types of questions (2 marks and 4 marks questions),how many questions of 2 marks did he attempt correctly? (a) 5 (b) 10quad (c) 20 (d) 40

One Mark Question

In how many ways in which an examiner can assign 30 marks to 8 questions, giving not less than 2 marks to any question.

A question paper consist of questions, each carrying (1)/(2) mark, 1 mark and 2 marks ini the ratio 2:2:1. if the maximum mark in the exam is 100, then find the number of questions of each type.

There are 48 questions in a test.Each correct answer fetches 1 mark,for each wrong answer (1)/(2) mark is deducted.A student got 21 marks by attempting all questions.The number of questions answered wrongly is