6. A tanks initially holds 100 gallons of salt solution in which 50 bs of salt has been dissolved. A pipe fils the tank with brine at the rate of 3gpm containing 2 lbs of dissolved salt per gallon. Assuming that the mixture is kept uniform by stirring, a drain pipe draws out of the tank the mixture at 2gpm. Find the amount of salt in the tank at the ond of 30 minutoo?

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Equilibrium and Support Reactions

Civil engineers deal with structures that are composed of several members connected or with individual members such as beams and columns. To analyze such structures, the condition of statics must be applied. Under the static condition, the members are considered to be in equilibrium under the action of forces, that is, the members are assumed to be having negligible velocity.