SOLUTION: A STUDENT IS TAKING AN EXAM WITH 40 QUESTIONS ON IT. TO PASS THE EXAM SHE NEEDS TO ANSWER 70% OF THE QUESTIONS CORRECTLY. unfortunately she answered only 40% of the first 15 questi

Algebra ->  Average -> SOLUTION: A STUDENT IS TAKING AN EXAM WITH 40 QUESTIONS ON IT. TO PASS THE EXAM SHE NEEDS TO ANSWER 70% OF THE QUESTIONS CORRECTLY. unfortunately she answered only 40% of the first 15 questi      Log On


   



Question 279693: A STUDENT IS TAKING AN EXAM WITH 40 QUESTIONS ON IT. TO PASS THE EXAM SHE NEEDS TO ANSWER 70% OF THE QUESTIONS CORRECTLY. unfortunately she answered only 40% of the first 15 questions. What percent of the remaining 25 questions does she have to answer correctly to pass the exam?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
There are a total of 15+%2B+25+=+40 questions
She answered .4%2A15+=+6 correctly
To pass she needs to answer .7%2A40+=+28 correctly
and, since 28+-+6+=+22,
she needs to answer 22 of the last 25 questions correctly