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The value of a stamp collection

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A stamp collection consists of 3, 8, and 15 cent stamps. The number of 8 cent stamps is one less than triple the number of 3 cent stamps. The number of 15 cent stamps is six less than the number of 8 cent stamps. The total value of all the stamps is $2.47. Find the number of 8 cent stamps in the collection.

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Let the number of 3-cent stamps be denoted by x

"The number of 8-cent stamps is one less than triple the number of 3 cent stamps."

Translation:
The number of 8-cents stamps is 3x-1

"The number of 15-cent stamps is ...

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