book Maths Puzzle Numerical Ability

Solve the following algebraically using the substitution method.

2 - 1
- - =13
x y

3 2
- + - =2
x y

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book Other Question

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. I have a likert 5-point survey that I need to determine the percentage for each question on the survey. A total of 7 students filled out the questionnaire. All 7 students completed