book Maths Puzzle Numerical Ability

23.5-5.2-(-1.3)

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2 problems I am totally lost on, please help!!

the linear system of equations has the unique solution(10,-12)(there are many correct answers)

the linear system of equations h One day in math class, shelley ask the teacher, " Mr. Nelson, how old are you?"
Mr.Nelson responds: "This year Iam 3 times as ols as my sister. How ever. 6 years ago, I was five times as old as she was". How old is the math teacher?