Jisny is writing a class test. she knew all the answers but she got confused in the last question. the last question was to select a incorrect answer. Can you help her by choosing the incorrect answer ?
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Let the marks in Math be x and in English (30−x).
New marks in Math =2+x
New marks in English =27−x
(2+x)(27−x)=21054−2x+27x−x2=210x2−25x+156=0x2−12x−13x+156=0x(x−12)−13(x−12)=0(x−12)(x−13)=0x=12,13
If her marks in Math is 12, then in English she got 18.
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