Question

1. A test contains 10 true/false questions. A correct
answer is awarded 2 marks, a wrong answer -1 and
a question not answered is awarded 0. A student
attempts 7 questions and gets 8 marks. How many
questions did the student answer correctly?​

Answer 1

Answer:

5 correct and 2 wrong

Explanation:

5 X 2 = 10 - 2 = 8 marks

Answer 2

Answer:

5

Explanation:

let no. of correct questions answered by student be = x

let no. of wrong questions answered be = y

x + y = 7 ....(1)

2(x) - y(1) = 8

2x - y = 8 ....(2)

(1) + (2)

3x = 15

x = 5

5 + y = 7

y = 2