Question

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

Answer 1

Answer:

(i)10

(ii)20

Step-by-step explanation:

(i)she got 10 correct,

she scored 20 marks,

for each correct she +3,

for every wrong -1.

Thus,

10 * 3 = 30

30 - 20 = 10.

Total in incorrect is 10.

(ii) 10 + 10 = 20.

★ 10 are which she got correct (give in the question) and other 10 are which is got incorrect (from q.(i))