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From the condition, you have these two equations in 2 unknowns
+ = 350. (1)
+ = 1200. (2)
Multiply eq(1) by 4 (both sides). Keep equation (2) as is. You will get
+ = 1400. (1')
+ = 1200. (2')
Now subtract eq(2') from eq(1'). You will get
= 200,
which implies y = 600.
Then from (2) = 1200 - 600 = 600; hence. x = = 750.
Answer. Tanker X volume is 750 mL. Tanker y volume is 600 mL.
Solved.
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I used the Elimination method to solve the system of equations.
So, on the way you learned on how the Elimination method works.