If the average (arithmetic mean) of x and y is 40, and z – x = 60, what is the average of y and z?
Choose the most appropriate option
A) 20 B) 50 C) 65 D) 70 E) 140
x+y/2 = 40   =&gt; x+y = 80   x = z - 60...sub this value   z-60+y = 80   =&gt;z+y = 140   =&gt;z+y/2 = 70.   ANSWER:70
<result>D</result>
If the average (arithmetic mean) of x and y is 40, and z – x = 60, what is the average of y and z?