Letter to King Author (9/6/17)

Dear King Author,

I understand that you have lost your golden crown. Five other crowns were discovered and you need help finding out which crown was your original crown. I have figured out which crown is pure gold. Crown #4, recovered by Gawain, is pure gold. In this letter, I will tell you how I have got to this conclusion.

I figured out which crown is pure gold using density. Density is the amount of "stuff," or mass that is is a certain "space," or volume. To figure out the density of a material, it is mass divided by volume. The measurements for mass and volume are grams and centimeters, so the mathematical equation is g/cm3 . For each of the crowns, I used this mathematical calculation. I found the mass of each crown and divided it by the volume, 180 cm3. Once I got the density of each of the crowns, I referred back to the chart that you offered to me. I matched up the density of the crowns with the density of the common substances. I figured out that the crown recovered by Gawain is the pure gold crown because it had a density of 19.3 cm3, the same as gold.

I also figured out the density of the other crowns, so that I would know whether there is more than one pure gold crown. Also using the chart you gave me, I figured out what each crown is made of. Crown #1, retrieved by Lancelot has a density of 10.5 cm3, therefore it is silver. Crown #2, found by Percival has a density of 2.7 cm3, the same as aluminum. The third crown, recovered by Bedivere is made of steel because its density is 7.8 cm3. The last crown found by Galahand has a density of 13.5 cm3, therefore it is made of lead.

In conclusion, that is the scientific reason that the crown that is recovered by Gawain, is your original pure gold crown. I used the mass and volume to find the density of each crown and compared it to the density of different common substances on the chart that you gave me.

Sincerely,

Mira



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