This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
To evaluate , we first convert the given ratios into fractions.
Step 1: Convert ratios to fractional form. From , we have: From , we have:
Step 2: Express and in terms of and respectively. From , we can write : From , we can write :
Step 3: Substitute the expressions for and into .
Step 4: Simplify the complex fraction. To simplify, multiply the numerator by the reciprocal of the denominator: Now, simplify the numerical part: Divide both the numerator and the denominator of the numerical fraction by their greatest common divisor, which is 40:
The expression for is: \frac{2b{5y}} Send me the next one 📸
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This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.