In an examination there are 30 questions. 1 mark is given for each correct answer and 0.25 is deducted for every incorrect answer. ankur attempted all the questions and scored 13.75. how many incorrect answers did he have?
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Answered by
37
ANSWER
>>>>>>>>>>>>>>>>>
Let the no. of incorrect question be (30-x) and correct questions be x
EQUATION
x - 0.25 ( 30-x ) = 13.75
x - 7.5 + 0.25x = 13.75
1.25x = 13.75 + 7.5
1.25x = 21.25
x = 21.25 / 1.25
x = 17
>>>>>>>>>>>>>>>>>>>>
NO. OF CORRECT ANSWERS = 17
NO. OF INCORRECT ANSWERS = 30-17 = 13
ANSWER = 13
>>>>≥>>>>>>>>>>>>>>>
●◆●◆ HOPE IT HELPS ●◆●◆
>>>>>>>>>>>>>>>>>
Let the no. of incorrect question be (30-x) and correct questions be x
EQUATION
x - 0.25 ( 30-x ) = 13.75
x - 7.5 + 0.25x = 13.75
1.25x = 13.75 + 7.5
1.25x = 21.25
x = 21.25 / 1.25
x = 17
>>>>>>>>>>>>>>>>>>>>
NO. OF CORRECT ANSWERS = 17
NO. OF INCORRECT ANSWERS = 30-17 = 13
ANSWER = 13
>>>>≥>>>>>>>>>>>>>>>
●◆●◆ HOPE IT HELPS ●◆●◆
Answered by
5
Answer:
Let the no. of incorrect question be (30-x) and correct questions be x
EQUATION
x - 0.25 ( 30-x ) = 13.75
x - 7.5 + 0.25x = 13.75
1.25x = 13.75 + 7.5
1.25x = 21.25
x = 21.25 / 1.25
x = 17
NO. OF CORRECT ANSWERS = 17
NO. OF INCORRECT ANSWERS = 30-17 = 13
ANSWER = 13
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