Question

2. In a quiz, positive marks are given for correct answers and negative marks are given
for incorrect answers. If Jack's scores in five successive rounds were 25,-5,-10
15 and 10, what was his total at the end?
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Answer 1

25+15+10-15= 35 total score is 35

Answer 2

so the answer is,

$25 + 15 + 10 - 5 - 10 \\ = 25 + 15 + 10 - (5 + 10) \\ = 25 + 15 + 10 - 15 \\ = 40 + 10 - 15 \\ = 50 - 15 \\ = 35 \: (ans)$