Question

In a maths competition each correct answer gets three marks, but one mark is deducted for each incorrect answer.

Grace answers all 30 questions and scores 30 marks. How many questions did she get wrong?

Answer 1

0

Explanation:

Because there was 30 question, and she got 30 marks

30 - 30 = 0

Answer 2

i think 20
there are 90 possible marks. since she got 30, i divided 30/90. which resulted in 0.333333. i think multiplied that by 30 to get the number of correct answers which was 10, leaving 20 incorrect