Posted by **Jannie** on Wednesday, November 17, 2010 at 12:32am.

Multiple-choice questions in a test are graded by adding 2 marks for each correct

response and subtracting 1 mark for each incorrect response (including no response).

Rory and Jenny answered all the multiple-choice questions, with Rory scoring 27 and

Jenny scoring 42. Rory answered 19 questions correctly.

a How many multiple-choice questions were there?

b How many more questions than Rory did Jenny answer correctly?

- Maths -
**Anonymous**, Wednesday, May 4, 2011 at 6:34pm
i don't care / know

- Maths -
**SEEBOK**, Thursday, July 14, 2011 at 1:35pm
a.Rory

(19 correct ans X 2) 38

Rory's score -27

equals (incorrect ans)11 pts deducted

therefore

19 correct + 11 incorrect = 30 questions

b.jenny

Let x= correct answers

y= incorrect answers

equations:

2x-y=42 eq1(which is the score of jenny)

x+y=30 eq2(total no. of items)

use elimination method

then:

3x=72

divided both sides by 3

x=24

substituting to eq.1

2x-y=42

2(24)-y=42

48-y=42

y=48-42

y=6

or substituting to eq.2

x+y=30

24+y=30

y=30-24

y=6

therefore

jenny got 24 correct answers and 6 incorrect answers.

- Maths -
**Cheyane**, Wednesday, April 25, 2012 at 8:51pm
Answer for Jenny bought a gallon of orange juice. The recipe for punch calls for 2 quarts of juice. How many quarts will she have left over to drink at breakfast.

- Maths -
**Hey Anonymous**, Monday, March 3, 2014 at 10:21am
Screw you!!!

## Answer This Question

## Related Questions

- maths - In a test there were 25 multiple-choice questions. They were marked as ...
- maths - In a test there were 25 multiple-choice questions. They were marked as ...
- Stats - An instructor gives a test with 20 multiple choice questions. There are ...
- Algebra - A test has 15 questions worth 100 points in total. The test consists ...
- Stat HW for. - 1. A student taking a midterm exam in Ancient History comes to ...
- Statistical concept 68-95-99.7 - 1. A student taking a midterm exam in Ancient ...
- Statistics - An unprepared student is about to take his first test of the ...
- probabilities - A multiple choice test has 16 questions. Each question has 4 ...
- Algebra - An algebra teacher is writing a test. There will be two types of ...
- Math (Algebra) - Gretchen and Ezia received equal scores on a test made up of ...

More Related Questions