6 клас

[Гост]

В златарски цех разполагат с 1,5 кг. чисто злато. Колко мед трябва да се прибави към това злато, за да се получи 14-каратово злато?

[Реклама]

[vladob]

Definition: The karat system is used to reveal the amount of pure gold found in an item.

24 karat (24K) gold is pure gold.

18 karat (18K) gold contains 18 parts gold and 6 parts another metal or metals, making it 75% gold.

14 karat (14K) gold contains 14 parts gold and 10 parts another metal or metals, making it 58.3% gold.

10 karat (10K) gold contains 10 parts gold and 14 parts another metal or metals, making it 41.7% gold. 10k gold is the minimum karat designation that can still be called gold in the US.


Значи: Ако 1,5 кг е 58,3%, 100% од сместата е 1,5/0,583 = 2,572898799 кг

[Irrefutable]

[tex]\frac{3}{2} * \frac{10}{14} =\frac{15}{14} =1,0(714285)[/tex]