標題:
f.1 maths
發問:
1. One number is 4 times that of another number. Their sum is 45. What are the numbers?2. In a test, Peter gets 2 marks for each correct sum and loses 1 mark for each wrong sum. He does 18 sums and obtains 24marks. How many correct sums does he get?3. A boy divides 60 marbles into 2 groups so that 7 times the... 顯示更多 1. One number is 4 times that of another number. Their sum is 45. What are the numbers? 2. In a test, Peter gets 2 marks for each correct sum and loses 1 mark for each wrong sum. He does 18 sums and obtains 24marks. How many correct sums does he get? 3. A boy divides 60 marbles into 2 groups so that 7 times the smaller group is equal to 3 times the larger group. What is the number of marbles in the larger group?
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最佳解答:
1. One number is 4 times that of another number. Their sum is 45. What are the numbers? Let be the number x, 4x + x = 45 5x = 45 x = 9 Therefore the number is 9 and 36 (45-9). 2. In a test, Peter gets 2 marks for each correct sum and loses 1 mark for each wrong sum. He does 18 sums and obtains 24marks. How many correct sums does he get? Let correct sums be x, wrong sum be (18 - x): 2x + (18 - x)1 = 24 2x + 18-x = 24 x = 6 Therefore he get 6 correct sum. 3. boy divides 60 marbles into 2 groups so that 7 times the smaller group is equal to 3 times the larger group. What is the number of marbles in the larger group? Let be the number of marbles in the smaller group is 7x, larger group is 3x: 60 - 7x = 3x 60 = 10x x = 6 Therefore the larger group have 18 marbles.
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