What runs around the whole yard without moving?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

Can you count the number of lines in the below picture?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

I have feet, but no legs. Which animal Am I?