Answer
Step-by-step explanation:
question is incomplete neither the equation is given nor the formula
but best to my knowledge lets take a example and solve the question
(see given picture)
answer for that would be (b)
20 picks in total .
Answer:
n=3
20+20+20 length +width+ height
20×3
x = 31/3
4x+8+2x+20=90
4x+2x+8+20=90
6x+28=90
6x+28-28=90-28
6x=62
38