Word problem: 1. In a test (+5) marks are given for every correct answer and (-2) marks are given (4) for every

Word problem:

1. In a test (+5) marks are given for every correct answer and (-2) marks are given (4)
for every incorrect answer.
a) Jay gets eight correct and seven incorrect answers. What is his score?
b) Tom answered all the questions and scored 20 marks though he got 10 correct answers.
How many incorrect answers has he attempted?

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