Yeah scored 40 marks in a test,receiving 3 marks for every right answer and losing 1 mark for each wrong answer.Had 4 marks been awarded for each correct answer and 2 marks been deducted for each incorrect answer, then yeah would have scored 50 marks. How many questions were there in a test
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Answer:
there were a total of 20question . you got 15 right and 5 wrong
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Step-by-step explanation:
let y be the correct answers and z be the wrong ones
3y - z = 40
4y - 2z = 50
divide the equations and cross multiply
15y - 5z = 16y - 8z
solve for y
y = 3z
substitute this in first equation
9z - z = 40
so z = 5
substitute z in first equation
y = 15
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