Question
The average (arithmetic means) of t and y is 15, and the average of w and x 15. What is the average of t, w, x, and y?
(A) 7.5
(B) 15
(C) 22.5
(D) 30
(E) 60
(A) 7.5
(B) 15
(C) 22.5
(D) 30
(E) 60
Answers
Anonymous
t + y = 15
t + y / 2 = 15
2 * t + y / 2 = 15 *2
t + y = 30
w + x = 15
w + x / 2 = 15
2 * w + x / 2 = 15 * 2
w + x = 30
t + y + w + x / 4
30 + 30 / 4
60 / 4
15
t + y / 2 = 15
2 * t + y / 2 = 15 *2
t + y = 30
w + x = 15
w + x / 2 = 15
2 * w + x / 2 = 15 * 2
w + x = 30
t + y + w + x / 4
30 + 30 / 4
60 / 4
15