please solve question fast emergency please
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Let incorrect ques=x
15*6+x*(-3)=30
90-3x=30
-3x=30-90
-3x=-60
X=60/3=20
So he attempted 20 sums incorrectly
15*6+x*(-3)=30
90-3x=30
-3x=30-90
-3x=-60
X=60/3=20
So he attempted 20 sums incorrectly
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