college student

by MARIA
(SALT LAKE CITY, UT)

Alvin's age is three times Elga's age. The sum of their ages is " 40 ". What is Elga's age?

Let x be Alvin's age

Let y be Elga's age

x + y = 40

x = 3y

Replace x = 3y into x + y = 40

We get 3y + y = 40

4y = 40

4y/4 = 40 / 4

y = 10

So Elga is 10 years old

Alvin's age is x = 3y = 3 times 10 = 30





Comments for college student

Average Rating starstarstarstarstar

Click here to add your own comments

Apr 04, 2015
Rating
starstarstarstarstar
Mathematics problem
by: Anonymous

I think it is algebra problem. I don't know the answer. I think every college student face the same problem.

Jan 05, 2015
Rating
starstarstarstarstar
Nice one
by: Anonymous

That was an interesting problem. I finally solved one problem without much effort. I love solving high school mathematics problems. It is not that I’m an expert. But I love doing it during my free time. Keep updating more problems.


Feb 03, 2014
Rating
starstarstarstarstar
nice
by: PCB manufacture

Thanks for sharing





Click here to add your own comments

Join in and write your own page! It's easy to do. How? Simply click here to return to System of linear equations.





Recent Articles

  1. Least Common Multiple Worksheet

    Oct 18, 17 10:58 AM

    Least common multiple worksheet- get some practice looking for the least common multiple

    Read More

New math lessons

Your email is safe with us. We will only use it to inform you about new math lessons.

            Follow me on Pinterest


Page copy protected against web site content infringement by Copyscape





Recent Lessons

  1. Least Common Multiple Worksheet

    Oct 18, 17 10:58 AM

    Least common multiple worksheet- get some practice looking for the least common multiple

    Read More

  Our Top Pages

Formula for percentage

Compatible numbers

Basic math test

Basic math formulas

Types of angles

Math problem solver

Algebra word problems

Surface area of a cube

Finding the average 

Scale drawings

Tough Algebra Word Problems.

If you can solve these problems with no help, you must be a genius!


Everything you need to prepare for an important exam!

K-12 tests, GED math test, basic math tests, geometry tests, algebra tests. 


Real Life Math Skills

Learn about investing money, budgeting your money, paying taxes, mortgage loans, and even the math involved in playing baseball.

 Recommended

Scientific Notation Quiz

Types of Angles Quiz

Graphing Slope Quiz

Adding and Subtracting Matrices Quiz  

Factoring Trinomials Quiz 

Solving Absolute Value Equations Quiz  

Order of Operations Quiz