Hello,

$\displaystyle 1 \text{ ton }=907.18474 \text{ kg }$ (I know the tons in kg, I hope you were speaking of "short tons")

So $\displaystyle 4.96 \times 10^{-7} \text{ tons }=907.18474 \times 4.96 \times 10^{-7} \text{ kg }$

So I don't think your answer is right.

Hmmm if L stands for Litres, then it is not possible since L is for volumes, not areas !

1 foot=304.8 mm. (we know that 1 foot=30.48 cm and 1cm=10mm)

So 20ft x 30ft=(20*304.8)(30*304.8) mm˛=5.57*10^7

Okay.

I think you have a problem with the cm, mm, etc... meanings.

The standard unit is m (for meter)

Here is a table of correspondance :

$\displaystyle \begin{array}{c|c} \text{Power} & \text{Writing} \\ \hline

10^{-3} \text{ m} & \text{mm} \\

10^{-2} \text{ m} & \text{cm} \\

10^{-1} \text{ m} & \text{dm} \\

{\color{red}10^{0} \text{ m}} & {\color{red}\text{m}} \\

10^{1} \text{ m} & \text{dam} \\

10^{2} \text{ m} & \text{hm} \\

10^{3} \text{ m} & \text{km}

\end{array}$

remember that the same letters in front of m apply to litres and grams.

We know that 1 gallon = 3,78541178 litres

Now, remember that 1L=1 dm^3, that is to say $\displaystyle (10^{-1} m)^3=10^{-3} m^3$

or $\displaystyle 1 dm^3=(10*cm)^3=1000 cm^3$

Try to do it

No, it is

dm^3

Edit : I must say I cheat a little since I'm in a country where we use these metric systems. On the contrary, it's a real difficulty if we travel to the USA