book Maths Puzzle Numerical Ability

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

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book Other Question

Solve the following algebraically using the substitution method.

2 - 1
- - =13
x y

3 2
- + - =2
x y
(6x to the second power)(7)