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 dont 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 ...
- algbrea - Francine and Cheryl received equal scores on a test made up of ...
- Geometry - I HAVE A QUESTION. When I post a question and there is now response ...
- Math - Given a multiple choice test with 4 choices for each question and 17 ...
- ENGLISH/MATH/SCIENCE HELP! - Is there any websites for teens to read short ...
- math-Probablity - A student is writing a multiple choice test consisting of 40 ...
- math help - I need help solving this math problem, please: Problem: Angela's ...
- Math - I need help solving this math problem, please: Problem: Angela's math ...

More Related Questions