DS from prep software!

[poonamchiK]

In a certain yr, the difference between Mary and James salary is 2x the difference between Mary and Kim s salary. If mary's salary is highest, whats the average salary of all 3?

[editor: DO NOT abbreviate, paraphrase, or change questions in any way. any future posts in which this occurs will be deleted immediately. thanks.]

a. James salary = 30,000
b. Kim s salary = 40,000

my answer is c which is wrong. corect answer is b.
this question is from prep software.

[poonamchiK]

Thx in advance!

[vivekcall81]

The equation work out like this:
M-j = 2(M-k)
m+j-k=0......i
if we add to i
2k then m+k+j=2k=40000
dividing it by 3 will give average.

[RonPurewal]

try these:

data-sufficiency-mary-s-and-jim-s-annual-salaries-t2347.html

in-a-certain-year-the-difference-between-mary-s-and-jim-s-t3273.html