# Math

posted by Sidney

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?

1. Steve

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.

2. Sidney

Ok

3. asfaque

50%

4. malak

que es la simetria

5. sri

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% ?

6. Elena

15/6 x 7/6

7. Samiah

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

8. Never tell

That was actually the wrong answer!!

9. ahmed

box 569 divided by 6 is 400

what digit show be in the box?

10. Giancarlo chavez

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

11. Giancarlo chavez

Circo time

12. Drequan

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?

13. Anonymous

What is the median of this set of values?
6, 8, 10, 8, 4, 2, 12

14. DAVID O

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

15. Damian

80 miles on 6 gallons of gas is 13.33

16. Damian

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

17. Angel

Frank gave away 15% of his mone. he gave 72 dollars how much he have

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