Raj got $\frac{3}{4}$ times the marks as obtained by Nil in the annual examination of Mathematics. The sum of their marks is $140$. Represent this as a pair of linear equations in two variables.

• A
  Let $x$ be the marks of Raj and $y$ be the marks of Nil.
• B
  The equations are $x = \frac{3}{4}y$ and $x + y = 140$.
• C
  The equations are $3x - 4y = 0$ and $x + y = 140$.
• D
  The equations are $4x - 3y = 0$ and $x + y = 140$.