A cow can be milked in 5 minutes, but it must be milked twice a day. If 6 cows can be milked at a time, how many cows can be milked in 10 minutes?

12

explanation:

you can milk 6 in five minutes so you multiple 6 by to because 10 is 5 two times

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)