Question

Consider the enlargement of the rectangle. Use the proportion to find the missing dimension bod the original rectangle. (Sorry the pic is horrible)

Answer 1

Here's the right way:

$\dfrac{x}{\frac 3 5} = \dfrac{20}{12}$

$x = \dfrac{20}{12} \cdot \dfrac{3}{5} = 1$

Here's the way they want you to do it:

$\dfrac{x}{\frac 3 5} = \dfrac{20}{12}$

$12 x = 20 \times \dfrac{3}{5} = 12 \textrm{ FIRST BOX}$

$x = 12/12 = 1 \textrm{ SECOND BOX}$

Answer 2

Answer: 12×=12

×=1, this the correct answer :3