In a test (+5) marks are given for correct answers and (-2) marks are given for every incorrect answer. riley answered all the question and scored 30 marks and got 10 correct answers. how many incorrect answers did she attempt?

Riley got 10 incorrect answers.

Step-by-step explanation:

If she got 10 correct answers she got 50 marks because each correct answer gives +5 marks and 10×5 is 50.

However, in the end Riley got 30 Mark's and the difference between 50 and 30 is 20 so -20 marks is taken from 50.

Furthermore, each incorrect answer gives -2 marks and (-20÷-2 is 10) so Riley got 10 incorrect answers.

If every 5 marks is one correct answer and she got ten correct then she should've gotten 50 marks but she only got thirty and 2 marks are taken away for every missed question which is a 20 difference so she should have 10 incorrect answers

93.8

step-by-step explanation:

lets say, first number = x

second number = 3x+7

total = 49

(x)+(3x+7)= 49

4x+7 = 49

4x = 42

x = 42/4

x= 10.5

x= 10.5

3x+7 = 3(10.5)+7 = 93.8

hope this