Question

In a class test , 3 marks are awarded for every correct answer and (-2) marks are awarded for every incorrect answer and no marks for not attempting any questions. ( find the following given below ).

1) Irine scored 20 marks . if she has got 12 correct answers , how many questions has she attempted incorrectly ?

2) Chloe scored (-5) though she has got 7 correct answers . how many questions has she attempted not correctly ? ​

Answer 1

`\huge\sf {solution}`

#1

• Marks awarded for onecorrect answers = 3
• Marks awarded for 12 correct answers = 3 × 12 = 36
• Marks obtained for incorrect answers = 20 - 36 = -16
• Marks given for 1 incorrect answer = -2

• Therefore, ( - 16 ) ÷ ( - 2 ) = 8

hence , irene has attempted 8 questions incorrectly

#2

• Marks scored by chloe for 7 correct answers = 3 × 7 = 21
• chloe scored = -5
• Marks obtained for incorrect answers = -5 - 21 = -26
• Marks awarded for 1 incorrect answer = -2

• Therefore , number of incorrect answer = -26 / -2 = 13

hence , chloe has attempted 13 questions not correctly

Hope it helps ( ╹▽╹ )~