Proportion Quiz

1. If $y \propto x$ and $y=20$ when $x=4$, find $y$ when $x=7$

• A. $28$
• B. $35$
• C. $23$
• D. $140$

2. If $y$ is inversely proportional to $x$ and $y=6$ when $x=10$, find $y$ when $x=3$

• A. $20$
• B. $1.8$
• C. $60$
• D. $2$

3. Which equation represents '$y$ is proportional to the cube of $x$'?

• A. $y=kx^3$
• B. $y=k\sqrt[3]{x}$
• C. $y=\frac{k}{x^3}$
• D. $y=3kx$

4. Share £150 in the ratio 3:2

• A. £90 : £60
• B. £75 : £75
• C. £100 : £50
• D. £120 : £30

5. $y$ is proportional to $x^2$. If $x$ is doubled, what happens to $y$?

• A. $y$ doubles
• B. $y$ stays the same
• C. $y$ is multiplied by 4
• D. $y$ is multiplied by 8