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.
Building Materials - A Closer Look at Different Types of Wood. When considering lumber or wood for various woodcraft projects or construction, there is a wide variety from which to choose. The type of wood you use will depend on the project. Some wood is more suitable than others are for building construction, while other wood types are popular for the creating of instruments or novelty items. In general, there are two main types of wood with the main difference being the way trees reproduce.