The alloy weighing 800 g contains 60% zinc. 200 g of zinc was added to the alloy

The alloy weighing 800 g contains 60% zinc. 200 g of zinc was added to the alloy and re-melted. How much zinc is contained in the new alloy?

Let’s solve this problem through the proportion:

1) (800 * 60%) / 100% = 480 (gram) – found zinc in the 1st solution.

2) 480 + 200 = 680 (gram) – calculated the amount of zinc in the new solution.

3) 800 + 200 = 1000 (gram) – found the mass of a new solution.

Let’s make the proportion:

1000 grams – 100%;

680 grams – x;

Find x:

x = (680 g * 100%) / 1000 g = 68% – the amount of zinc in the new solution.

Answer: 68%.