Question

$x:2a46b$

$y:1025c3045$

$z:90def20$ $x,y,z$ are proportional to each other. What is the proportionality between $y$ and $z$

• A. direct
• B. inverse
• C. none
• D. can't be determined

Answer 1

The correct option is B inverse

$\frac{x}{y}=\frac{2}{10}=\frac{6}{30}=\frac{1}{5}=constant\Rightarrow x\propto y$

$y\times z=10\times 90=45\times 20=900=constant\Rightarrow y\propto \frac{1}{z}$