During a car race, two competitors will stop to fill up the fuel tank. One does it every 4 laps, and the other every 5 laps.
When the race begins, after how many laps will they meet at the fuel station, if they travel at the same speed?
Solution
The first competitor refill the tank every 4 laps
The first competitor will refill the tank after 4 laps, 8 laps, 12 laps, etc...
The situation is shown below
4, 8, 12, 16, 20, 24, 28, 32, 36
40, 44, 48, 52, 56, 60
The other competitor will refill the tank after 5 laps, 10 laps, 15 laps, etc...
The situation is shown below
5, 10, 15, 20, 25, 30, 35, 40
45, 50, 55, 60
The number in bold are what they have in common.
They will meet at the gas station after 20 laps, 40 laps, 60 laps, etc..
The least number they have in common is 20
We can also call this number the least common multiple.
May 19, 19 09:20 AM
Basic math review game - The one and only math adventure game online. Embark on a quest to solve math problems!
Basic math formulas
Algebra word problems
New math lessons
Your email is safe with us. We will only use it to inform you about new math lessons.
Recommended
Scientific Notation Quiz
Graphing Slope Quiz
Adding and Subtracting Matrices Quiz
Factoring Trinomials Quiz
Solving Absolute Value Equations Quiz
Order of Operations Quiz
Types of angles quiz
May 19, 19 09:20 AM
Basic math review game - The one and only math adventure game online. Embark on a quest to solve math problems!