To solve an indirect proportion math problem, identify the two given proportions. Next, multiply the increasing quantity and decreasing quantity of the known proportion to find the constant. Use the constant in the indirect proportion equation to solve for the unknown value.
Know MoreIf given a problem asks how many hours it takes five people to paint a house if it previously took eight people 17 hours, determine which value increases when the other decreases. In this problem, when the number of people increases, the time decreases.
The formula to determine the constant is x * y = k. Since the time it takes to paint the house with five people is the unknown, time is assigned to the y variable, and the number of people is assigned to x. Therefore, the constant is 136.
The formula to solve an indirect proportion is y = (k / x). K is the constant, y is the unknown value and x is the known value. For example, if the constant is 136 and x equals five, the equation is (136 / 5) = 27.2. Therefore, painting the house takes 27.2 hours with five people.
Solve simple mathematical proportions by writing the ratios as fractions, setting these fractions equal to each other, cross-multiplying and then solving for any variables. A simple ratio to solve is 2:x = 3:9, which means "2 is to x as 3 is to 9."
Full Answer >The numbers to add in an addition problem are called addends, summands or terms, while the answer to the problem is the sum. In the number sentence a+b=c, a and b are addends, while c is the sum.
Full Answer >Calculations that a person does in his head without the use of external aids is called mental math. It is the most common form of calculation in daily life, as it can quickly perform simple calculations and estimations.
Full Answer >"Digits" are the symbols or characters used to represent a number visually. A number like five contains one digit, whereas a number like 555 contains three digits. This is easily seen when they are written as numerals: 5 versus 555.
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