What is the circumference of a circle with a diameter of 6 feet? Use 3.14 for pie.
2 answers:
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Answer: The dealer should use 5 grams of alloy that is 90% gold and a3 grams of alloy that is 50% gold.
Step-by-step explanation:
Let x be the weight of alloy having 90% gold and y be the weight of alloy having 50% gold .
Given : A jeweler wants to make 8 grams of a mixture that is 75% gold. She has an alloy that is 90% gold and an alloy that is 50% gold.
According to the above statement , we have the following system of equations :-
Multiply 2 on both the sides of equation (2), we get
Subtract eqn (1) from eqn (3), we get
Put value of x=5 in (1), we get
Hence, the dealer should use 5 grams of alloy that is 90% gold and 3 grams of alloy that is 50% gold.