Consider the two tanks shown in figure.The tank A Contains 50 gallons of water in which 25 Ib of salt is dissolved. Suppose that tank B Contains 50 gallons of pure water. Liquid is pumped in to and out of tanks as indicate in figure. The mixture exchanged between the two tanks and the liquid pumped out of tank B are assumed to be well stirred, so the equation of amount of salt at time (t) in tank A (x1(t)) is: Misture (1 gal/ min) Pure water (3 gal/ min) Mixture (3 gal/ min) Mixture (4 gal/ min)
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
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