In a competition, 2 marks are allotted to every right answer and -1 for every wrong
answer.
i) Ali got 6 correct and 4 wrong answers. What is his score?
ii) Tina scored 15. 10 of her answers were correct. How many answers were incorrect?
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(i) (6×2)+(4×-1)
=12-4
=8
Ali scored 8 Marks.
(ii) 15=(10×2)+(x×-1)
15=20-x
15-20=-x
-5=-x
x=5
Tina's 5 answers were incorrect.
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