anonymous
  • anonymous
On a certain multiple-choice test, 9 points are awarded for each correct answer, and 7 points are deducted for each incorrect or unanswered question. Sally received a total score of 0 points on the test. If the test has fewer than 30 questions, how many questions are on the test?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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DanJS
  • DanJS
9*(#correct) - 7*(#wrong) = 0 --given
DanJS
  • DanJS
there are two variables there and only one equation, need one more to be able to solve
anonymous
  • anonymous
Cannot be determined 16 19 21 24

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More answers

DanJS
  • DanJS
If the test has fewer than 30 questions... that is the second given thing
DanJS
  • DanJS
Total questions = #correct + #wrong
DanJS
  • DanJS
which is less than 30
campbell_st
  • campbell_st
just write it as a ratio 9 correct = 7wrong so the ratio is 9:7 16 parts so 7 correct and 9 wrong
DanJS
  • DanJS
that works
anonymous
  • anonymous
can we also use 9x7 and 7x9 ?
DanJS
  • DanJS
what cambell did was take the first equation that was given.. 9*(#correct) - 7*(#wrong) = 0 and solve it as a ratio of correct/wrong
DanJS
  • DanJS
and the total correct and wrong has to be less than 30
anonymous
  • anonymous
|dw:1441233943898:dw|
DanJS
  • DanJS
no...
anonymous
  • anonymous
yesssssss because 63 -63= 0
DanJS
  • DanJS
9*(#correct) - 7*(#wrong) = 0 you have to have correct = 7 and wrong = 9, otherwise it is not true
DanJS
  • DanJS
the correct and wrong answers are worth different points
anonymous
  • anonymous
yea thats what i did dont u see it?
anonymous
  • anonymous
9 points for 7 questions which equals to 63 and 7 points for 9 questions which is 63 deducted so total equals 0
DanJS
  • DanJS
sorry if i read something wrong... this is the summary of it...second
DanJS
  • DanJS
let: #right = R and # wrong = W --------------------------------- given: 9*R - 7*W = 0 and R + W < 30 --------------------- solve for ratio of R vs W from the first equation... \[\frac{ R }{ W }=\frac{ 7 }{ 9 }\]
anonymous
  • anonymous
yea thats what i did. Thank youuuu =)
DanJS
  • DanJS
with having 7 right and 9 wrong, comes out to zero points...
DanJS
  • DanJS
7+9 is 16 questions... the next choice is 32 questions, but that is too much . 14 right and 18 wrong
DanJS
  • DanJS
k welcome

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