edited by
447 views
0 votes
0 votes

In an examination, the average marks obtained by students who passed was $x\%$, while the average of those who failed was $y\%$. The average marks of all students taking the exam was $z\%$. Find in terms of $x, y$ and $z$, the percentage of students taking the exam who failed.

  1. $\left ( z-x \right )\left ( y-x \right )$
  2. $\left ( x-z \right )\left ( y-z \right )$
  3. $\left ( y-z \right )\left ( z-y \right )$
  4. $\left ( y-z \right )\left ( x-z \right )$
edited by

Please log in or register to answer this question.

Related questions

2 votes
2 votes
1 answer
1
Arjun asked Mar 1, 2020
1,015 views
If $r, s$ and $t$ are consecutive odd integers with $r < s < t$, which of the following must be true?$rs = t$$r + t = 2t – s$$r + s = t – 2$$r + t = 2s$
0 votes
0 votes
0 answers
2
1 votes
1 votes
1 answer
3
Arjun asked Mar 1, 2020
634 views
$\text{P, Q and R}$ are three consecutive odd numbers in ascending order. If the value of three times $\text{P}$ is three less than two times $\text{R}$, find the value o...
1 votes
1 votes
1 answer
4
0 votes
0 votes
0 answers
5