Purchase Solution

Word problems

Not what you're looking for?

Ask Custom Question

1.) The average of 5 numbers is 36. The first 4 numbers are 17, 23, 50, and 20. Find the 5th number.

a.) Write an algebraic equation for this problem using "x" as the missing number.

b.) Solve the equation for the missing number (x)

2.) If you invest $1200 at 4% simple interest, how much additional money would you need to invest at 6% simple interest to obtain $300 in total interest?

a.) Write an algebraic equation for this problem using "x" as the amount needed.

b.) Solve the equation for the unknown amount.

Purchase this Solution

Solution Summary

The solution provides examples of writing equations and solving them from word problems.

Solution Preview

1. Let the fifth (missing) number be x. Now the numbers are 17, 23, 50, 20 and x. Their average is given by (17+23+50+20+x)/5. This simplifies to (110+x)/5. We are given that the average of these five numbers as 36. Hence, we equate both these quantities to get (110+x)/5=36. Multiplying by 5 on both ...

Purchase this Solution


Free BrainMass Quizzes
Know Your Linear Equations

Each question is a choice-summary multiple choice question that will present you with a linear equation and then make 4 statements about that equation. You must determine which of the 4 statements are true (if any) in regards to the equation.

Probability Quiz

Some questions on probability

Graphs and Functions

This quiz helps you easily identify a function and test your understanding of ranges, domains , function inverses and transformations.

Solving quadratic inequalities

This quiz test you on how well you are familiar with solving quadratic inequalities.

Multiplying Complex Numbers

This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.