Question of the Day #344 (22/9/10)

Kazza

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Ruby had $40.00. Her dad gave her another $30.00 and her mum gave her $10.00 to buy a new DVD. The DVD Ruby wants costs $54.99. If Ruby buys the DVD, write an equation using a variable to describe the amount of money that Ruby will have to contribute to have enough money for the DVD.


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Also, rep points can't always be applied straight away - limits on the site - but all should be updated by the Sunday after the QOTD
 
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Kazza

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Ruby had $40.00. Her dad gave her another $30.00 and her mum gave her $10.00 to buy a new DVD. The DVD Ruby wants costs $54.99. If Ruby buys the DVD, write an equation using a variable to describe the amount of money that Ruby will have to contribute to have enough money for the DVD.


Few different ways, but this is one:

Let x = Ruby's contribution

$30.00 + $10.00 = $40.00

$40.00 + x = $54.99

x = $14.99



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Astpierre, you didn't post on the thread :spank:
 
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