Question

in a maths test there are 60 questions. there is 2 marks for every correct answer and 1/3 marks is deducted for each unattemped question or wrong. if zaheer got 50 how many questions did he answer correctly

Answer 1

let the no. of correct answers be x

and no. of wrong answers be y

according to the condition

x+y=60

x=60-y ----- eqn 1

2x -1/3y=50

putting the value of xx in eqn 1

2(60-y)-1y/3=50

120-2y-1y/3=50

-2y-1y/3=-70

-6y-y/3=-70

-7y=-210

y=30

putting the value of y in eqn 1

x=60-30

x=30

the number of questions he answered correctly is 30

Answer 2

Answer:

30

Step-by-step explanation:

let the no. of correct answers be x

and no. of wrong answers be y

according to the condition

x+y=60

x=60-y ----- eqn 1

2x -1/3y=50

putting the value of xx in eqn 1

2(60-y)-1y/3=50

120-2y-1y/3=50

-2y-1y/3=-70

-6y-y/3=-70

-7y=-210

y=30

putting the value of y in eqn 1

x=60-30

x=30

the number of questions he answered correctly is 30