Final: The Last Spin
Part of the Expressions & Data section of Coddy's Pre-Algebra journey. Lesson 52 of 52.
A spinner has three colours, and the chances of two of them are given. Every spin lands on exactly one colour, and that fact is enough to find the third chance. The answer is a fraction in lowest terms.
Challenge
A spinner lands on red with probability 3/10 and on blue with probability 1/5. Otherwise it lands on green. Find the probability p of green, as a fraction in lowest terms.
This is the last problem of Pre-Algebra. The next step is Algebra, where a letter like p becomes an unknown that you solve for.
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
Test yourselfThis lesson includes a short quiz. Start the lesson to answer it and track your progress.
All lessons in Expressions & Data
1Variables and Expressions
What a Variable IsWriting ExpressionsExpressions from StoriesTwo OperationsRecap: Expressions4Combining Like Terms
Like TermsLetters and NumbersNegative TermsTwo LettersDistribute, Then CollectRecap: Like Terms10Final Challenges
Final: Two BracketsFinal: A Cubic ExpressionFinal: The Phone PlanFinal: A Decimal MeanFinal: The Last Spin2Evaluating Expressions
Substituting a ValueNegative InputsPowers in ExpressionsFormulasRecap: Evaluating5Patterns and Sequences
Continuing a PatternThe Common DifferenceThe nth TermWriting the RuleRecap: Sequences3The Distributive Property
Number PropertiesMental MathDistributing LettersDistributing a MinusRecap: Distributing