SOLUTION: My son has a math worksheet that he needs to score at least 90% on. It has 12 problems on it. How do we figure how many problems he has to get right in order to score at least 90%?

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: My son has a math worksheet that he needs to score at least 90% on. It has 12 problems on it. How do we figure how many problems he has to get right in order to score at least 90%?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 522491: My son has a math worksheet that he needs to score at least 90% on. It has 12 problems on it. How do we figure how many problems he has to get right in order to score at least 90%?
Found 3 solutions by scott8148, jim_thompson5910, oberobic:
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
x / 12 = .9

x = 10.8

Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
x/12 = 90/100


x/12 = 0.9


x = 0.9*12


x = 10.8


So he needs to get 11 problems correct (you round up to the nearest whole number)


If you need more help, email me at jim_thompson5910@hotmail.com

Also, please consider visiting my website: http://www.freewebs.com/jimthompson5910/home.html and making a donation. Thank you

Jim

Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
Assuming there are a total of 100 points, 100/12 = 8 1/3 points per answer.
.
To score at least 90, means 90 or more.
.
x = number of correct answers
.
100/12*x >= 90
.
100x = 1080
.
x = 10.8
.
Assuming you can only get full credit for an answer or no credit, then your son must get at least 11 of the 12 questions right to have a score of 90% or higher.
.
Done.