In an examination, Mark attempted 22 questions correctly and secured 54 marks. If there are two types of questions i.e. of 2 marks and 3 marks, how many questions of 2 marks did he attempt correctly?
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let the number of 2 mark question mark attempted be x so the no. of 3 mark question attempted by him be 22-x
atq
2(x)+3(22-x)=54
2x+66-3x=54
-x+66=54
66-54=x
x=12
no. of 2 mark question attempted are x= 12
no of 3 mark questions are 22-x=22-12=10
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