This video shows the method to solve word problems using proportions. In the given problem, we have to find the time taken by a person to type 390 words if the person takes 1 minute to type 30 words. This can be solved using proportions. We take two fractions which are equal. We type '30 words' in the numerator of the first fraction and 1 minute in its denominator. This fraction must be proportional to the second fraction. The second fraction has '390 words' in the numerator and the variable 'x' to represent the time which we have to find. This can be written as (30 words)/(1 minute)=(390 words)/(x minutes). Cross multiplying we get 30x=390 or x=13 minutes. Thus the final answer is 13 minutes.
 Hot
 Latest

How To: Calculate Faster Than a Calculator

Find the discriminant (DELTA): quadratic equation

How To: Calculate the sampling distribution of difference between means

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Identify characteristics of a sample during a survey

How To: Find the percentage of a number easily

How To: Compute a square root using the geometric method

How To: Calculate the area of complex shapes

How To: Isolate a variable

How To: Find the area of a parallelogram using geometry

How To: Calculate the area of a parallelogram

How To: Convert decimals into fractions

How To: Determine math proportions with the SquareCube Law

How To: Remember "greater than" & "less than" symbols

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the area & perimeter of triangles & squares

How To: Determine the age of a fossil using carbon14

How To: Calculate percent composition for chemistry

How To: Calculate probability in "at least one" problems

How To: Calculate Faster Than a Calculator

Find the discriminant (DELTA): quadratic equation

How To: Calculate the sampling distribution of difference between means

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Identify characteristics of a sample during a survey

How To: Find the percentage of a number easily

How To: Compute a square root using the geometric method

How To: Calculate the area of complex shapes

How To: Isolate a variable

How To: Find the area of a parallelogram using geometry

How To: Calculate the area of a parallelogram

How To: Convert decimals into fractions

How To: Determine math proportions with the SquareCube Law

How To: Remember "greater than" & "less than" symbols

How To: Find a number given Its percent

How To: Do long division without a calculator

How To: Find the area & perimeter of triangles & squares

How To: Determine the age of a fossil using carbon14

How To: Calculate percent composition for chemistry

How To: Calculate probability in "at least one" problems
Be the First to Comment
Share Your Thoughts