Question

A timber merchant needs to transport logs of wood on a truck. The logs are arranged such that the base layer contains 20 logs, the layer above it 19. Each layer has 1 log less than the layer above it, leaving the top most layer with a single log. Find the number number of layers thus formed and the total number of logs transported.

Answer 1

Answer:

20 layers

total logs are 210

Step-by-step explanation:

these the question of ncert cl 10 AP

a=20

d=-1

l=1

1=20+(n-1)(-1)

19=n-1

20=n

S=10*21=210