SOLUTION: Mr X has twice as much as invested in stocks as bonds. Last year, the stock investment paid 7.5% of their value while the bonds paid 10% of their value. If the total that both inve

Question 934668: Mr X has twice as much as invested in stocks as bonds. Last year, the stock investment paid 7.5% of their value while the bonds paid 10% of their value. If the total that both investments paid last year was R 1000, how much did Mr X have invested in stocks?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = amount invested in stocks at 7.5%
y = amount invested in bonds at 10.0%
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x = 2y
0.075x + 0.100y = 1000
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put the system of linear equations into standard form
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x - 2y = 0
0.075x + 0.100y = 1000
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = amount invested in stocks at 7.5% = 8000 R
y = amount invested in bonds at 10.0% = 4000 R
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