Question

A jeweler has a 20 gram ring that is 60%gold and 40% silver. he wants to melt it down and add enough gold to make it 80% gold. How many grams of gold should be added?

Un joyero tiene un anillo de 20 gramos que es 60% de oro y 40% de plata. quiere derretirlo y agregar suficiente oro para que sea 80% de oro. ¿Cuántos gramos de oro se deben agregar?

Answer 1

Respuesta:

He has to add 4 grams.

Explicación paso a paso:

Because the 60% of 20 is 12 so the 80% of 20 is 16, he has to add

4 gold grams.