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Simple Interest math : simple interest formula, tricks and examples.

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Simple Interest math: People need large amount of money for various reasons like buying a car, land, house, farm, education of children, etc.. Ordinary people always need money. If this large amount is not readily available with us, we can borrow it from a bank or a co-operative credit society. This borrowed amount is called loan. However, at the time of returning the loan to the bank or credit society, we have to pay back an amount somewhat bigger than the loan. This additional amount is called simple interest. Suppose Sachin borrowed Rs 4,00,000 from a bank to buy a car. When he paid back his loan after two years, he gave the bank an amount of Rs 4,50,000. That is, he paid an additional amount of Rs 50,000. It means that he paid Rs 50,000 as simple interest. The amount borrowed is called the principal. The principal period of time for which the amount is borrowed is called either ' period ' or ' time ' . In the above example, the principal is Rs 4,00,...
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Single equation method | Single equation model | Example of single equation.

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Single equation method :  An equation has a single variable, that equation is called a single variable. If the variable exponent of a variable equation is 1, then that equation is called a simple equation. Example : a + 7 = 18 The value at which the variable satisfies the equation is called a unitary equation. Examples of single equation : 1)  3a + 4 = 10             3a = 10 - 4             3a = 6             a = 6 / 3             a = 2 2) 4a + 1 = 9            4a = 9 - 1            4a = 8            a = 8 / 4            a = 2 3) 3b - 5 = 4           3b = 4 + 5           3b = 9           b = 9 / 3           b = 3 4) (...
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Time Speed Distance formulas, tricks, shortcuts, time Speed and distance problems.

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Time, Speed & Distance  formulas, tricks : Some important formulae : Distance = Time × Speed Speed = Distance / Time. Time = Distance / Speed. Important facts : If two objects move parallel in the same direction, then their  relative speed is equal to the difference of their movements. If two objects move in a parallel opposite direction, then their relative speed is equal to the sum of their movements. When converting km/hr to meters/ second, multiply by 5/18. When converting meters/second to km/hr, multiply by 18/5. The sum of the speed opposite the direction of the train should be added. If the direction of the train is the same, the speed should be subtracted. In mathematics, add up all the long distance and calculate the distance to the total lobby. If a person covers a certain distance at a speed of X km/hr and an equal distance with Y km/hr, then the average speed for the entire journey = ( 2XY ) / (X + Y ) km/hr If the boat moves in th...
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