document.write( "Question 922704: 150 question - each 1 mark for wright answer
\n" ); document.write( "if wrong - 1 mark will cut for each question
\n" ); document.write( "i got 90 marks then how much correct answer did i got \n" ); document.write( "
Algebra.Com's Answer #559678 by srinivas.g(540)\"\" \"About 
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let x be the no of correct answers you did
\n" ); document.write( "let y be the no of wrong answers you did
\n" ); document.write( " so x+y = 150 ----eq(1)
\n" ); document.write( " marks you got is 90
\n" ); document.write( " so x*(1)+y(-1)= 90
\n" ); document.write( " x-y =90
\n" ); document.write( " move y to the right
\n" ); document.write( " x = 90+y
\n" ); document.write( " put this x= 90+yin x+y= 150
\n" ); document.write( " (90+y)+y= 150
\n" ); document.write( " 90+2y = 150
\n" ); document.write( " subtract 90 on both sides
\n" ); document.write( " 90+2y -90 =150-90
\n" ); document.write( " 2y = 60
\n" ); document.write( " divide with 2 on both sides
\n" ); document.write( " 2y/2 = 60/2
\n" ); document.write( " y= 30
\n" ); document.write( " x= 90+y= 90+30 =120
\n" ); document.write( "so no of correct answers you made = 120
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