A quiz has 20 questions with 7 points awarded for each correct answer , 2 points deducted for each wrong answer , and 0 for each question omitted (omitted means not answered the question ) Jack scored 87 points. how many questions did he omit ?

Jack omitted 5 questions

Step-by-step explanation:

There are 20 questions

7 points given for each correct answer

2 points deducted for each wrong answer

0 for each question omitted.

Jack scored 87 points.

Maximum points Jack could get is 20*7=140 points

Let's use trial and error.

Let Jack answered 13 correct, 2 wrong and 5 omitted

So, 13*7=91

2*-2=-4

So, 91-4=87

Jack omitted 5 questions.

answer: 15

step-by-step explanation: