Question

Find the missing entry.

$\begin{array}{cccccc}\text{Quantity}& 1& 3& 5& 7& 9\\ \text{Price}& 50& 150& 250& ?& 450\end{array}$

• A. 100
• B. 200
• C. 550
• D. 350

Answer 1

The correct option is D

350

We see that price increases as the quantity increases.
And,
$\frac{1}{50}=\frac{3}{150}=\frac{5}{250}$.

So price is directly proportional to quantity.

Let the blank be "$x$".

$\frac{1}{50}=\frac{7}{x}\therefore x=350$