book Maths Puzzle Numerical Ability

A chemist added 90 liters of alcohol solution A to 108 liters of 22 percent alcohol solution to get 37 percent solution. Express the concentration of the solution A in percentage. Put % after your answer.

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OK I DONT GET HOW TO DO IT...
2/3 * 1/3??...
Solve the following algebraically using the substitution method.

2 - 1
- - =13
x y

3 2
- + - =2
x y