Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tham khảo tài liệu 'math word problem demystified phần 6', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . LESSON 14 Solving Mixture Problems The equation is Alloy 1 Alloy 2 . Alloy 3 70 x 50 l2 - x 65 12 IMPLEMENTATION Solve the equation 70 x 50 12 - x 65 12 0.70x 0.50 12 - x 0.65 12 0.70x 6 - 0.50x 7.8 0.20x 6 - 6 7.Ố - 6 0.2x 1.8 o x 1.8 _ 0.2 X 9 ounces of Alloy 1 12 x 12 9 3 ounces of Alloy 2 Hence 9 ounces of the 70 alloy should be mixed with 3 ounces of the 50 alloy to get 12 ounces of an alloy which is 65 silver. EVALUATION Check the equation 70 x 50 12 - x 65 12 70 9 50 3 65 12 6.3 1.5 7.8 7.8 7.8 Another type of percent mixture requires that a mixture be diluted to make a weaker concentration of the mixture. If the amounts are the same then a portion of the higher concentration mixture must be removed and the same amount of the weaker mixture must be added. In this case the equation would look like this Mixture 1 Amount to be Amount of weaker mixture Mixture 2 removed to be added LESSON 14 Solving Mixture Problems The equation is Alloy 1 Alloy 2 Alloy 3 70 x 50 12 - X 65 12 IMPLEMENTATION Solve the equation 70 x 50 12 -x 65 12 0.70x 0.50 12 - x 0.65 12 0.70x 6 - 0.50x 7.8 0.20x 6 - 6 7.8 - 6 0.2x 1.8 Ờ X _ 1.8 o 02 X 9 ounces of Alloy 1 12 X 12-9 3 ounces of Alloy 2 Hence 9 ounces of the 70 alloy should be mixed with 3 ounces of the 50 alloy to get 12 ounces of an alloy which is 65 silver. EVALUATION Check the equation 70 x 50 12 - x 65 12 70 9 50 3 65 12 6.3 1.5 7.8 7.8 7.8 Another type of percent mixture requires that a mixture be diluted to make a weaker concentration of the mixture. If the amounts are the same then a portion of the higher concentration mixture must be removed and the same amount of the weaker mixture must be added. In this case the equation would look like this Mixture 1 Amount to be Amount of weaker mixture Mixture 2 removed to be added SON 14 Solving Mixture Problems The equation is Alloy 1 Alloy 2 Alloy 3 70 x 50 12 - x 65 12 IMPLEMENTATION Solve the equation 70 x 50 l2 - x 65 12 0.70x 0.50 12 x 0.65 12 0.70x 6 - 0.50x 7.8 0.20x 6-6 .
