One third of Aman's marks in Mathematics exceeds a half of his marks in English by 30. If he got 240 marks in the two subjects together, how many marks did he get in English?
সমাধান
সঠিক উত্তর: Option D
Let, Aman's marks in Mathematics be x and marks in English be y.
Total marks in both the subject = 240
∴ x + y = 240
⇒ 2(x + y) = 240 × 2
⇒ 2x + 2y = 480 ..................(1)
(x/3) - (y/2) = 30
⇒ (2x - 3y)/6 = 30
⇒ 2x - 3y = (30 × 6)
⇒ 2x - 3y = 180 ..................(2)
Subtracting equation (1) from equation (2) we get,
2x - 3y = 180
2x + 2y = 480
- 5y = - 300
⇒ y = - 300/- 5
∴ y = 60
∴ He scored 60 marks in English.
Total marks in both the subject = 240
∴ x + y = 240
⇒ 2(x + y) = 240 × 2
⇒ 2x + 2y = 480 ..................(1)
(x/3) - (y/2) = 30
⇒ (2x - 3y)/6 = 30
⇒ 2x - 3y = (30 × 6)
⇒ 2x - 3y = 180 ..................(2)
Subtracting equation (1) from equation (2) we get,
2x - 3y = 180
2x + 2y = 480
- 5y = - 300
⇒ y = - 300/- 5
∴ y = 60
∴ He scored 60 marks in English.
