Question

Both u and v vary directly with each other. When u is 10, v is 15, which of the following is not a possible pair of corresponding values of u and v?

• A. 2 and 3
• B. 8 and 12
• C. 15 and 20
• D. 25 and 37.5

Answer 1

The correct option is C 15 and 20

Since, u and v vary directly, ie u/v = k(constant)
If u = 10 and v = 15, then,
$\frac{u}{v}=\frac{10}{15}=\frac{2}{3}\Rightarrow \frac{8}{12}=\frac{2}{3}\Rightarrow \frac{15}{20}=\frac{3}{4}\Rightarrow \frac{25}{37.5}=\frac{2}{3}$
So, option (c) is not a possible pair of corresponding values of u and v.