SOLUTION: Elva invested $2100 in the stock market. she purchased shares in world oil at $7.50 shares, and zinco Mines at $3.25 / share. if the total number of shares was 450, how many for e

Question 1128687: Elva invested $2100 in the stock market. she purchased shares in world oil at $7.50 shares, and zinco Mines at $3.25 / share. if the total number of shares was 450, how many for each stock did she buy ?
Found 2 solutions by josmiceli, MathTherapy:
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = number of share of World Oil
Let = number of shares of Zinco Mines
---------------------------------------------------
(1)
(2)
-------------------------------------
(2)
Multiply both sides of (1) by and
subtract (1) from (2)
(1)
-------------------------------------

and
(1)
(1)
----------------------------
150 shares of World Oil
300 shares of Zinco Mines
-------------------------------
check:
(2)
(2)
(2)
(2)
Ok
Answer by MathTherapy(10552) (Show Source): You can put this solution on YOUR website!
Elva invested $2100 in the stock market. she purchased shares in world oil at $7.50 shares, and zinco Mines at $3.25 / share. if the total number of shares was 450, how many for each stock did she buy?

Let amount of World Oil shares purchased be W
Then number of Zinco Mines shares purchased = 450 -W
Then we get: 7.5W + 3.25(450 - W) = 2,100
7.5W + 1,462.5 - 3.25W = 2,100
4.25W = 637.5
W, or number of World Oil shares purchased =
Number of Zinco Mines shares purchased:
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