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.
Uses: Softwoods are most often used in dimension lumber for construction framing, pulpwood for paper, and sheet goods including particleboard, plywood and fiberboard. Species examples: Cedar, Douglas fir, juniper, pine, redwood, spruce and yew. Density: Softwoods are typically lighter in weight and less dense than hardwoods. Cost: Most species are considerably less expensive than hardwoods, making them the clear favorite for any structural application where the wood will not be seen.