Question

solve for r in the proportion.\\(\frac{r}{20} = \frac{18}{40}\\)

Explanation:

Step1: Cross-multiply to eliminate denominators

$r \times 40 = 18 \times 20$

Step2: Calculate both sides of the equation

$40r = 360$

Step3: Isolate $r$ by dividing by 40

$r = \frac{360}{40} = 9$

Answer:

$r = 9$