In a class test, the sum of Moulika’s marks in Mathematics and English is 30. If she got 2 marks more in Mathematics and 3 marks less in English, the product of her marks have been 210. Find her marks in the two subjects.
Maths = 12, English = 18 (or)
Maths = 13, English = 17
Let marks in Mathematics be x , marks in English be 30 - x
When marks in Mathematics is increased by 2 it becomes x + 2
When marks in English is decreased by 3 it becomes 27 - x
According to the problem the product of the two marks is 210
(x + 2)(27 - x) = 210
⇒ - x2 + 25x + 54 = 210
⇒ x2 - 25x + 156 = 0
Performing factorization we get:
⇒ x2 - 13x - 12x + 156 = 0
⇒ x(x - 13) - 12(x - 13) = 0
⇒ (x - 12)(x - 13) = 0
⇒ x = 12,13
There will be two answers
Mathematics = 12 ,English = (30 - 12) = 18
Mathematics = 13, English = (30 - 13) = 17
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