Question

In a test (+5) marks are given for every correct answer and (-2) marks are given for every incorrect answer . Roy answered all the questions and scored 30 marks though she got 10 correct? Find the total number of sums.

Answer 1

Marks given for one correct answer = 5

So, marks given for 10 correct answers  

= 5 X 10 = 50

Radhika's score = 30

Marks obtained for incorrect answer

= 30- 50 = -20

Marks given for one incorrect answer  

= (-2)

Therefore, number of incorrect answers

= (−20)÷(−2)=10

Hope it helps You!!!

Answer 2

+5 for the correct answer and -2 for the incorrect one.

+5 x 10 = +50; 10 as the correct answer.

50 - 30 = 20

⇒ 20 ÷ 2 = 10; -2 as 2 the incorrect one

10 answers were wrong

∴ The total number of sums is 20.