Question

In a test, +3 marks are given for every correct answer and -1 mark is given for every incorrect answer. Sonal attempted all the questions and scored +20 marks, though she got 10 correct answers. (a) How many incorrect answers has she attempted? (b) How many questions were given in the test?

Answer 1

Step-by-step explanation:

3×10 - y=20

y=10

therefore no. of incorrect answers is 10.

total no. of questions=x+y=20