The average of marks obtained by X and Y is 35 less than the average marks obtained by Y and Z. If the marks obtained by Z is 85, what is the marks obtained by X ?
Answer & explanation
Correct answer: option 2
Lets assume avg. marks obtained by Y and Z is a, so avg. marks obtained by X and Y are a - 35
As marks obtained by Z = 85,
⇒ marks obtained by Y = 2a - 85
As per question,
X + Y = 2 x (a - 35)
X + 2a - 85 = 2a - 70
X = 15