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math 一問
發問:
1. $1000 is divided between Anna and Ben. If Ben receives less than twice as much as Anna by $200, how much does Anna receive? 2. Pitt is 6 years old and his father is 46 years old now. After how many years will Pitt's age be 1/5 of his father's age?
最佳解答:
1. $1000 is divided between Anna and Ben. If Ben receives less than twice as much as Anna by $200, how much does Anna receive? Let Anna receives $x Ben receives $y x + y = 1000……(Q1) y = 2x - 200……(Q2) put(Q2)into(Q1) x + 2x - 200 = 1000 3x = 1200 x = 400 Therefore, Anna receives $400 2. Pitt is 6 years old and his father is 46 years old now. After how many years will Pitt's age be 1/5 of his father's age? Let x years needed (6+x)/(46+x) = (1/5) 30+5x = 46+x 4x = 16 x= 4 Therefore, 4 years are needed 如有不足/有錯 請發信聯絡 另外，嚴禁抄襲！ 請發問者/投票者慎選答案 還有的是人家答了大家就不要答！ 加我好友^_^
1.$1000 is divided between Anna and Ben. If Ben receives less than twice as much as Anna by $200, how much does Anna receive? Let x be the amount of money for Anna. Anna's money = $ (x) Ben's money = $ (2x - 200) so, Anna's money + Ben's money = the total x + (2x - 200) = 1000 x + 2x - 200 = 1000 3x - 200 = 1000 3x = 1200 x = 400 So Anna gets $400. // 2.Pitt is 6 years old and his father is 46 years old now. After how many years will Pitt's age be 1/5 of his father's age? Let y be the number of years. 6+y = 1/5 x (46 + y) (6+y) x 5 = 1/5 x (4+y) x 5 30 + 5y = 46 + y 30 + 4y = 46 4y = 16 y = 4 It will take 4 years. // Hope you find this useful :)
math 一問
發問:
1. $1000 is divided between Anna and Ben. If Ben receives less than twice as much as Anna by $200, how much does Anna receive? 2. Pitt is 6 years old and his father is 46 years old now. After how many years will Pitt's age be 1/5 of his father's age?
最佳解答:
1. $1000 is divided between Anna and Ben. If Ben receives less than twice as much as Anna by $200, how much does Anna receive? Let Anna receives $x Ben receives $y x + y = 1000……(Q1) y = 2x - 200……(Q2) put(Q2)into(Q1) x + 2x - 200 = 1000 3x = 1200 x = 400 Therefore, Anna receives $400 2. Pitt is 6 years old and his father is 46 years old now. After how many years will Pitt's age be 1/5 of his father's age? Let x years needed (6+x)/(46+x) = (1/5) 30+5x = 46+x 4x = 16 x= 4 Therefore, 4 years are needed 如有不足/有錯 請發信聯絡 另外，嚴禁抄襲！ 請發問者/投票者慎選答案 還有的是人家答了大家就不要答！ 加我好友^_^
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其他解答:1.$1000 is divided between Anna and Ben. If Ben receives less than twice as much as Anna by $200, how much does Anna receive? Let x be the amount of money for Anna. Anna's money = $ (x) Ben's money = $ (2x - 200) so, Anna's money + Ben's money = the total x + (2x - 200) = 1000 x + 2x - 200 = 1000 3x - 200 = 1000 3x = 1200 x = 400 So Anna gets $400. // 2.Pitt is 6 years old and his father is 46 years old now. After how many years will Pitt's age be 1/5 of his father's age? Let y be the number of years. 6+y = 1/5 x (46 + y) (6+y) x 5 = 1/5 x (4+y) x 5 30 + 5y = 46 + y 30 + 4y = 46 4y = 16 y = 4 It will take 4 years. // Hope you find this useful :)
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