This is a proportion problem. You know that $50 corresponds to 0.90g, and you want to find out how much 20 dollars corresponds to.

Let $ x $ be the unknown weight corresponding to 20 dollars. You can set up the proportion as follows:

\[
\frac{50}{0.90} = \frac{20}{x}
\]

Now, solve for $ x $:

1. Cross-multiply: 
   \[
   50 \times x = 0.90 \times 20
   \]
2. Simplify:
   \[
   50x = 18
   \]
3. Divide both sides by 50 to solve for $ x $:
   \[
   x = \frac{18}{50} =

Learn how to solve a proportion problem involving money and weight. Given that $50 corresponds to 0.90g, find out how much 20 dollars corresponds to. This problem involves setting up and solving a proportion equation. Suitable for students in Grades 6-8.

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