Question

Find the missing price.

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

• A. 350

Answer 1

The correct option is A 350

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

So, the price is directly proportional to the quantity.

Let the blank be "$x$".

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