Shannon needs 20g of 80% gold to make a pendant. She has some 85% gold and some 70% gold from broken jewellery and wants to know how much of each she should use. Determine the quantity of each alloy that she should use
2 answers
pls help in 2 mins
Let x be the weight of 85% gold. Then the rest (20-x) is 70% gold.
So add up the gold in the parts, and it must equal the amount in the final alloy.
0.85x + 0.70(20-x) = 0.80*20
Now solve for s.
So add up the gold in the parts, and it must equal the amount in the final alloy.
0.85x + 0.70(20-x) = 0.80*20
Now solve for s.