If the average price of items is $125 and the average price of another items is $205, what is the average price of all items?
Not the most difficult question but, Im curious how they get B here.
I can plug in to the weighted avg formula and cancel out terms to get a # but wont the avg change with real values for M,N? Hence E?
stmt1: M+N = 20
not sufficient as we have to know avg of all the items we need to know the value (125M+205N)/(M+N)
stmt2: replace m by 2n in the above equation
(250 N+205N)/3N and u can find the value by canceling.
Avg would always be in terms of the above equation only cos even if the real values change, they will be in the proportion.
Like 20, 40 or 30, 60. so always the multiple N will be canceled out.
This is why B is the answer
My debrief: done-and-dusted-730-q49-v40