MSM05 wrote:

Guys, can you help me understand how to solve this problem:

Set T consist of 19 elements. The average of set T is L. If a new element is added to the set and the average grows by K, what is the value of the element?

А. L (1+K/5)

B. L*K/100 – 20L

C. 20L (1 + K/100)

D. 20 (1+K/100) – 19L

E. L*K/5 – 19 L

What am I missing?

Assume the 19 elements are 5 each ... hence the average of set T is 95/19 = 5= L

if a new element is added , say 25 .. the new average is 95+25/20 = 120/20 = 6

the average grows by 6-5 = 1 = K.

so the value of the element = 25 .. isnt it?

A 5*( 1+1/5) = 5*6/5 = 6

which is new average and not the new element.