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.
2x Lumber. Sometimes called âsticksâ or âstudsâ by contractors, 2x lumber (pronounced âtwo-byâ) is cheap, strong, and perfect for simple wood projects. Most 2x lumber youâll find at a home center comes from either spruce, pine, or fir trees, depending on which type of wood the supplier has at the time. Not that this makes any difference to us really, all three species are very similar. It does, however, explain the mysterious âSPFâ label: S=Spruce, P=Pine, F=Fir.