特里拥有的 $2 纸币数量是 $5 纸币的 3 倍。他一共有 $385。特里有多少张 $5 纸币？答：___

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完整解法

1. Define a variable for the number of $5-notes and express the number of $2-notes in terms of this variable.

Let $x$ be the number of $5-notes.
Then the number of $2-notes is $3x$ .

2. Form an equation based on the total value of the notes and solve for $x$.

Value of $5-notes = $5x$
Value of $2-notes = $2(3x) = 6x$
Total value = $5x + 6x = 11x$

Given the total value is $385:
$11x = 385$
$x = \frac{385}{11} = 35$

答案

$35$

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