Question

Sara scores -4 marks if she got three correct answers how many where incorrect. if each correct answer = 2 + and each wrong answer = - 0.5​

Answer 1

Step-by-step explanation:

let x for right answer and y for wrong answer. our mathematical equation will be-

2x-0.5y = -4

when she got three correct answer then x= 3

2*3 -0.5y = -4

6 - 0.5y = -4

0.5y = 10

y= 20

20 incorrect