Question

In an examination, a student attempted 23 questions and
secured 45 marks. If for every correct answer, 3 marks were

awarded and for every wrong answer, 1 mark was deducted,

then how many of his answers were wrong?​

Answer 1

Answer:

17

Step-by-step explanation:

let correct be x

let wrong be y

marks of correct=3x

marks of incorrect=1y

total=>

45=3x-1y----eq 1

total ques attempted=>

23=x+y------eq2

on adding eq 1 and two

68=4x

x=17

substitution of x=17 in eq 1

y=6

so 6 were incorrect