Question

In a competition, $(+5)$ marks are given for every correct answer and $(-2)$ marks for every incorrect answer. Anjali answered all the questions and scored $30$ marks. If she got $10$ correct answers, how many questions did she answer incorrectly?

• A. $20$
• B. $10$
• C. $5$
• D. $8$

Answer 1

The correct option is B $10$

No. of correct answers $=10$

Marks obtained $=10\times 5=50$

But Anjali got $=30$ marks

Incorrect marks $=50-30=20$ marks

No. of incorrect answers $=\frac{20}{2}=10$