An investor can sell her MicroTron stock for 36$ per share and her Dynaco stock for 68$ per share, If she sells 300 shares altogether, some of each stock, at an average price per share of 40$, how many shares of Dynaco stock has she sold? Answers.
A) 52	B) 37.5	C) 92	D) 136	E) 184
w1/w2 = (A2 - Aavg)/(Aavg - A1) = (68 - 40)/(40 - 36) = 28/4= 
<gadget id="calculator">28/4</gadget>
<output>7</output>
7/1= Number of MicroTron stocks/Number of Dynaco stocks   So for every 7 MicroTron stock, she sold 1 Dynaco stock.   So out of 300 total stocks, (1/7)th i.e. 300/8 = 37.5 must be Dynaco stock.   Answer (37.5)
<result>B</result>
An investor can sell her MicroTron stock for 36$ per share and her Dynaco stock for 68$ per share, If she sells 300 shares altogether, some of each stock, at an average price per share of 40$, how many shares of Dynaco stock has she sold?