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關於英文數學的問題
發問:
1There are a total of 30 $50-cent coins and $2-coins in a money box, and the total value of the coins is $42. How many coins of each denomination are there in the money box??2The leagth of a rectangular flower bed is 0.25m greather than 3 times its width. The flower bed has a perimeter of 20.5m(a) Find the... 顯示更多 1 There are a total of 30 $50-cent coins and $2-coins in a money box, and the total value of the coins is $42. How many coins of each denomination are there in the money box?? 2 The leagth of a rectangular flower bed is 0.25m greather than 3 times its width. The flower bed has a perimeter of 20.5m (a) Find the length of the flower bed. (b)Hence, find the area of the flower bed Thanks
最佳解答:
1 There are a total of 30 $50-cent coins and $2-coins in a money box, and the total value of the coins is $42. How many coins of each denomination are there in the money box?? 2 The leagth of a rectangular flower bed is 0.25m greather than 3 times its width. The flower bed has a perimeter of 20.5m (a) Find the length of the flower bed. (b)Hence, find the area of the flower bed Thanks 1)Let the number of $2-coins be n. 2n+(30-n)(0.5)=42 2n+15-0.5n=42 1.5n+15=42 1.5n=27 15n=270 n=18 ∴There are 18 $2-coins and 30-18=12 $50-cents in the money box 2a)Let the width of the flower bed be n. (3n+0.25+n)2=20.5 4n+0.25=10.25 4n=10 n=2.5 The length of the flower bed =3X2.5+0.25=7.75m b) The area of the flower bed=2.5X7.75=19.375m
關於英文數學的問題
發問:
1There are a total of 30 $50-cent coins and $2-coins in a money box, and the total value of the coins is $42. How many coins of each denomination are there in the money box??2The leagth of a rectangular flower bed is 0.25m greather than 3 times its width. The flower bed has a perimeter of 20.5m(a) Find the... 顯示更多 1 There are a total of 30 $50-cent coins and $2-coins in a money box, and the total value of the coins is $42. How many coins of each denomination are there in the money box?? 2 The leagth of a rectangular flower bed is 0.25m greather than 3 times its width. The flower bed has a perimeter of 20.5m (a) Find the length of the flower bed. (b)Hence, find the area of the flower bed Thanks
最佳解答:
1 There are a total of 30 $50-cent coins and $2-coins in a money box, and the total value of the coins is $42. How many coins of each denomination are there in the money box?? 2 The leagth of a rectangular flower bed is 0.25m greather than 3 times its width. The flower bed has a perimeter of 20.5m (a) Find the length of the flower bed. (b)Hence, find the area of the flower bed Thanks 1)Let the number of $2-coins be n. 2n+(30-n)(0.5)=42 2n+15-0.5n=42 1.5n+15=42 1.5n=27 15n=270 n=18 ∴There are 18 $2-coins and 30-18=12 $50-cents in the money box 2a)Let the width of the flower bed be n. (3n+0.25+n)2=20.5 4n+0.25=10.25 4n=10 n=2.5 The length of the flower bed =3X2.5+0.25=7.75m b) The area of the flower bed=2.5X7.75=19.375m
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