Question

Alex scored 8 marks on a test. However, he got 10 answers correct. How many marks did he lose for giving wrong answers?
(Note: Marks for correct answer = +1,
Mark for wrong answer -1)

Answer 1

Given:

Marks for correct answer = +1 and Mark for wrong answer -1

Marks scored = Correct answers x (+1) + Incorrect answers x (-1)

$\Rightarrow 8=(10\times 1)+(x\times (-1\left)\right)$

$\Rightarrow 8=10-x$

$\Rightarrow x=10-8$

$\Rightarrow x=2$

So, Alex lost 2 marks for giving wrong answer.