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Start by calling each score
[tex]\begin{gathered} \text{first score } \\ x+15 \\ \text{second score } \\ x \end{gathered}[/tex]then, write the equation for the sum
[tex]x+x+15=131[/tex]simplify the equation
[tex]2x+15=131[/tex]solve for x
[tex]\begin{gathered} 2x=131-15 \\ 2x=116 \\ x=58 \end{gathered}[/tex]the score for the first test is
[tex]58+15=73[/tex]the score for the second test is
[tex]58[/tex]