Question

If a recipe says 1/4 for 4 servings then how many cups will 8 serving be for?

Answer 1

$\dfrac{1}{4}\dots4 \\x\dots8 \\\dfrac{\frac{1}{4}}{x}=\dfrac{4}{8} \\\dfrac{1}{4x}=\dfrac{1}{2} \\1=2x \\x=\boxed{\dfrac{1}{2}}$

Hope this helps.