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An equation is a mathematical statement, in symbols, that two things are the same (or equivalent). Equations are written with an equal sign. Equations are often used to state the equality of two expressions containing one or more variables.

Percent means "parts per hundred", "out of hundred". Therefore, percent is a fraction with a denominator of 100. This denominator is expressed by the percent symbol "%."

How many legs in total do a chicken, a duck, and two sheep have?