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.
Varieties of hardwood lumber are the staple materials for the woodworker, particularly those who focus on fine woodworking projects such as furniture. However, the term hardwood can be a bit deceiving, as it has less to do with the hardness of the material than the species of the tree from which the lumber is harvested. Hardwoods come from deciduous, or broad-leaved trees, as opposed to softwoods, that are harvested from from evergreens. 1  In general, the lumber derived from hardwood species are typically harder than softwoods, although there are exceptions (balsa wood is very light and soft, but is considered a hardwood).