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

How To: Find the Percent Given Two Numbers

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

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

How To: Find a number given Its percent

How To: Calculate the area of a parallelogram

How To: Find the slope of a line given 2 points with fractions

How To: Find the standard error of the mean

How To: Learn Calculus in 20 minutes

How To: Derive the area of a circle

How To: Calculate the height and volume of a pyramid

How To: Find a missing angle in a parallelogram

How To: Minimize the sum of squared error for a regression line in statistics

How To: Calculate the width of a fence given its length and perimeter

How To: Graph a parabola

How To: Do long division without a calculator

How To: Find the area of a parallelogram using geometry

How To: Find the area of a circle when you know the diameter

How To: Solve for the missing ratios or proportions

How To: Find the Radius of a Circle from Arc Length

How To: Calculate Faster Than a Calculator

How To: Find the Percent Given Two Numbers

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

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

How To: Find a number given Its percent

How To: Calculate the area of a parallelogram

How To: Find the slope of a line given 2 points with fractions

How To: Find the standard error of the mean

How To: Learn Calculus in 20 minutes

How To: Derive the area of a circle

How To: Calculate the height and volume of a pyramid

How To: Find a missing angle in a parallelogram

How To: Minimize the sum of squared error for a regression line in statistics

How To: Calculate the width of a fence given its length and perimeter

How To: Graph a parabola

How To: Do long division without a calculator

How To: Find the area of a parallelogram using geometry

How To: Find the area of a circle when you know the diameter

How To: Solve for the missing ratios or proportions

How To: Find the Radius of a Circle from Arc Length
Be the First to Comment
Share Your Thoughts