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I bought an iTunes gift card for $50. After I bought some $4.99 apps my balance was $25.05. How many apps did I buy?

I bought an iTunes gift card for $50. After I bought some $4.99 apps my balance was $25.05. How many apps did I buy?
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2 Answers

   50.00  -  25.05. =  24.95
 
4.99x = 24.95
 
both sides are divided by 4.99 
 
The answer is 5 apps
$50-$4.99x=$25.05 where x=# of apps
$50-$25.05=$4.99x
$24.95=$4.99x
x=$24.95/$4.99
x=5 apps