question_answer 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 \[\text{25},-\text{ 5},-\text{ 1}0,\text{ 15}\] and 10, what was his total at the end?

Answer:

                Total at the end \[=\text{25}+\left( -\text{ 5} \right)+\left( -\text{ 1}0 \right)+\text{15}+\text{1}0\] \[=\text{ }\left\{ \text{25 }+\text{ 15 }+\text{ 1}0 \right\}+\left\{ \left( -\text{ 5} \right)+\left( -\text{ 1}0 \right) \right\}\] \[=\text{5}0+\left( -\text{15} \right)=\text{35}\]