Math brain teasers!!

There are books on a shelf, If 1 book is 4 from the left and 6 from the right, how many in all.

Does a pound of gold or a pound of feathers weigh more?

Tom's height is 6ft, he works at a butcher's shop, and wears size 9 shoes. What does he weigh?

What 3 positive numbers give the same results when multiplied and added together?

Mr. S has 2 kids. If the older kid is a boy, what are the odds the other kid is a boy?