Question

In a test, +3 marks are given for every correct answer and -1 mark is given for every incorrect answer.
Sona attempted all questions and got 10 answers correct. But her total score was only +20.
(a) How many incorrect answers did she give?
(b) How many questions were given in the test?​

Answer 1

Answer:

(a) 10

(b) 20

Step-by-step explanation:

all questions are given in the test are 20.

she answered 10 questions correctly

so every correct answer get +3marks

10×3=30

she wrong answered 10 questions

so every wrong answer get -1marks

10×(-1)=-10

--> 30-10=20.

her score is 20 marks.