Math

At Jefferson School, both 6th grade & 7th grade classes take a math test. The average score for the 6th grade is 80 and for the 7th grade is 90. If there are twice as many students, in the 7th grade as there is in the 6th grade, what is the average test score for both grades together?
80+90+90/3 = 86.6. I have to put 86.6 as a fraction in simplest form but I don't know what it is. Help please?

asked by Sidney
  1. If you have to use a fraction, why evaluate as a decimal? The average is 260/3.

    Of course, as a practical value, 86.7 is better than the fraction, since it is easier to visualize as a number on a scale of 1-100. But it is not as exact.

    posted by Steve
  2. Ok

    posted by Sidney
  3. 50%

    posted by asfaque
  4. que es la simetria

    posted by malak
  5. Can you please explain step by step to solve this problem? how does the number of students in 7th grade matter? doesnt the average remain the same 90% ?

    posted by sri
  6. 15/6 x 7/6

    posted by Elena
  7. Christine paid a plumber n dollars per hour for a 4hour job plus 60 for parts. The total charge was $280,

    posted by Samiah
  8. That was actually the wrong answer!!

    posted by Never tell
  9. box 569 divided by 6 is 400


    what digit show be in the box?

    posted by ahmed
  10. Tanner drives his vehicle around the circular road one time if the distance from the manhooe cover to tanner starting point 124 feet how many feet did tanner drive. The answer arr 12,070.16, 48,280, 389.36, 778.72

    posted by Giancarlo chavez
  11. Circo time

    posted by Giancarlo chavez
  12. 1. Charles brought 7/8 foot of electrical wire and 5/6 foot of copper wire for his science project. What is the least common denominator of the fraction?

    posted by Drequan
  13. What is the median of this set of values?
    6, 8, 10, 8, 4, 2, 12

    posted by Anonymous
  14. 86.6 is an addition of two numbers. They are; 86 and 0.6. 86 is already a whole number but 0.6 is not so lets change that. 0.6 can also be said to be 6/10. To broken down in the simplest form,lets divide both numbers(6&10) by their L.C.M which is 2 so we get 3/5. Therefore we add both 86 and 3/5 to give us 86+3/5=433/5. Therefore our final answer is equal to 86 whole number 3 over 5

    posted by DAVID O
  15. 80 miles on 6 gallons of gas is 13.33

    posted by Damian
  16. Noby does this any more probly, imma just play splix.io or happy wheels but i can't have a wallpaper bc greenspun took it away

    posted by Damian
  17. Frank gave away 15% of his mone. he gave 72 dollars how much he have

    posted by Angel

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