An Internet site sells 120 types of cell phones. The ratio of the number of smartphones to the number of feature phones is 3:5. How many of the 120 types of cell phones are smartphones? Please tell me the answer.
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The number of types of smartphones sold = 45
The total number of types of cell phones sold by the site = 120
Let the number of smartphones be x.
The number of feature phones = total - number of smartphones = 120 - x
Given,
Number of smartphones / Number of feature phones = 3/5
=> x / (120 - x) = 3/5
=> 5x = 360 - 3x
=> 8x = 360
=> x = 45
The number of types of smartphones sold by the site = 45
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