In a examination, a student attempted 15 questions correctly and secured 40 marks. If there were two types of questions i.e. of 2 marks and 4 marks, how many questions of 2 marks did he attempt correctly ?
5
10
12
15
A
5
B
10
C
12
D
15
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Solution
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Let the 2 marks questions attempted correctly =x The 4 marks questions attempted correctly =y Now, x+y=15 -----------(I) 2x+4y=40 ----------(II)
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