## jblovemath 3 years ago The concentration of platinum in a necklace is 12%. The necklace weighs 18 g. Find the amount of platinum in the necklace.

1. Walleye

fraction time! notice that the amout of platinum is 12/100 of the necklace. does this help?

2. jblovemath

do I divide by 18?

3. Walleye

Why did you choose to do that?

4. Walleye

Let me give you a hint. this is asking "how much of 18 grams is platinum"

5. jblovemath

12/100 divided by 18/1

6. Walleye

it is 12/100 * 18

7. Walleye

i should say (12/100) * 18

8. jblovemath

54/25

9. jblovemath

but I don't understand how many grams that is

10. Walleye

sorry brain fart for a second on my part think about this 12/100 is the amout of platinum in the necklace. 18 grams is the amout of material (12/100) * 18 is the amount of platinum in the necklace. so 54/25 is the amount of platinum in the necklace

11. Walleye

remember that 54/25 is just like saying 2.16 so there is 2.16 or 54/25 grams of platinum in the necklace

12. jblovemath

how did you get that?

13. Walleye

i typed 54/25 into a calculator :)

14. jblovemath

duh

15. jblovemath

thanks!!!!

16. Walleye

NP :D