8. Equations Involving Fractions

In this section, we can find the solution easily by multiplying throughout by the lowest common denominator.

Example 1

math expression

An aquarium can be filled by one hose in 7 minutes and a second thinner hose in 10 minutes. How long will it take to fill the tank if both hoses operate together?

Example 2

For 2 resistors with resistances R1and R2 in parallel, the combined resistance R is given by:

`1/R=1/R_1+1/R_2`

For a particular circuit, the combined resistance R was found to be 4 ohms (Ω), and R1= 10 Ω. Find R2.


Example 3

A car averaged 30 km/h going from home to work and 40 km/h on the return journey. If the total time for the two journeys is 50 minutes, how far is it from home to work?

Didn't find what you are looking for on this page? Try search:

Online Algebra Solver

This algebra solver can solve a wide range of math problems. (Please be patient while it loads.)

Online algebra solver - can solve your math problems step-by-step

Algebra Lessons on DVD

get MathTutorDVDs

Easy to understand algebra lessons on DVD. See samples before you commit.

More info: Algebra videos

Ready for a break?

shadow factory

Play a math game.

(Well, not really a math game, but each game was made using math...)

The IntMath Newsletter

Sign up for the free IntMath Newsletter. Get math study tips, information, news and updates each fortnight. Join thousands of satisfied students, teachers and parents!

Given name: * required

Family name:

email: * required

See the Interactive Mathematics spam guarantee.

Share IntMath!

Short URL for this Page

Save typing! You can use this URL to reach this page:

intmath.com/eqnfrac