The average age of 30 boys in a class is 16 years The average of the ages of the boys and the teacher is 17 years The age of teacher is? avg of 30 is 16=30*16=480 avg of 30 and 1 teacher is 17=31*17=527 Save then age of teacher is 527-480=47... 2012mm is the average rainfall of mumbai for last 13 years.
Types of Lumber: Softwood and Hardwood. There are two types of lumber: softwoods and hardwoods. Softwood lumber comes from conifer trees like pine, fir, spruce, and cedar. These woods get their classification for a reason; they can be easily dented with just your fingernail.
Lumber Types & Grades. 1  HEART PINE, or Longleaf Southern Yellow Pine, comes from the âheartâ or the tree, thus making it dense, strong, and highly resistant to decay and insect damage. Generally, it is no longer available for harvesting, therefore most usable lumber must be obtained through the salvage process. DADE COUNTY PINE is a subspecies of Heart Pine.