Use the chain rule. Let

and take
. The chain rule says

The relevant derivatives are then

(power rule)

(chain rule applied to
; the constant vanishes)
So,

This is what I get
(120-60%)-50%=24
Answer:
The odds of rolling a 3 on a 6-sided number cube is 1 out of 6. The odds of rolling a 3 on either of two 6-sided cubes are 1/3. This is because 1/6 * 2 = 1/3. Therefore, an average of one-third of rolls will have a 3 in them. 1/3 expressed as a decimal is .3 repeating (.3333333 etc) and that rounds to 33 which is less than 34.
Step-by-step explanation: