The average of x and t is y. If s = 2y, what is the average of s, x, and t in terms of y?
А. Зу
B. 2y
C. 5y/3
D. 4y/3
E. y

Explanation:

First focus on the fact that "the average of x and t is y". This means

(x+t)/2 = y

We basically add x and t, then divide by 2 to get the average y

We are then told that s = 2y, so we double the average

s = 2y

s = 2(x+t)/2

s = x+t notice the 2's cancel each other out when dividing

s turns out to be the sum of x and t, which is fitting I think

Now find the average of s, x, and t. You'll add the three values and divide by 3

(s+x+t)/3

(s + (x+t))/3

(s + s)/3 replace x+t with s

2s/3

2(2y)/3 ... plug in s = 2y

4y/3

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation: