Question

Square meters of ceiling Number of tiles 10.75 10 107.5 100 What is the value of the red X? Write your answer in decimal form and round to the tenths decimal place.

Answer 1

Let's use cross multiplication:

10------------------------->107.5

x--------------------------->100

`\begin{gathered} (10)/(x)=(107.5)/(100) \\ \text{Solve for x:} \\ x=(10\cdot(100))/(107.5)\approx9.3 \end{gathered}`