標題:
S3 math ex.
發問:
最佳解答:
Q1:can not solve 2010-09-10 19:04:31 補充： (67+82+78+86+x)/5=>80 313+x....................=>400 x............................=>87 He should obtain 87 marks in the fifth test so that he can get the reward! ______________________________________ Let x be the numbers of 2 coin ,y be the numbers of 5 coins: x+y....=22 y=22-x ____________ 2x+5y>83 2x+5(22-x)>83 2x+110-5x>83 x..............>9 the maximum number of $2 coins is 10.
其他解答:
1. Two cars travelling in opposite directions at speeds 65 km/h and 60 km/h respectively meet on a straight road. After at least how many minutes will their minimum distance be 5 km? How long does the two cars ? 2. Tony got 67, 82, 78 and 86 marks in four mathematics tests. His father promised to take him to the Ocean Park as a reward if his average score in five tests is 80 marks or above. What is the minimum score that he should obtain in the fifth test so that he can get the reward? 80 x 5 - 67 - 82 - 78 - 86 = 400 - 313 = 87 He should get at least 87 marks 3. Dick has 22 coins. Each coin is either a $2 coin or a $5 coin. The total value of the coins is more than $83. Find the maximum number of $2 coins that Dick has. Answer : 9A215E4A2B88AAE64
S3 math ex.
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Please to slove the following question.1. Two cars travelling in opposite directions at speeds 65 km/h and 60 km/h respectively meet on a straight road. After at least how many minutes will their minimum distance be 5 km?2. Tony got 67, 82, 78 and 86 marks in four mathematics tests. His... 顯示更多 Please to slove the following question. 1. Two cars travelling in opposite directions at speeds 65 km/h and 60 km/h respectively meet on a straight road. After at least how many minutes will their minimum distance be 5 km? 2. Tony got 67, 82, 78 and 86 marks in four mathematics tests. His father promised to take him to the Ocean Park as a reward if his average score in five tests is 80 marks or above. What is the minimum score that he should obtain in the fifth test so that he can get the reward? 3. Dick has 22 coins. Each coin is either a $2 coin or a $5 coin. The total value of the coins is more than $83. Find the maximum number of $2 coins that Dick has.最佳解答:
Q1:can not solve 2010-09-10 19:04:31 補充： (67+82+78+86+x)/5=>80 313+x....................=>400 x............................=>87 He should obtain 87 marks in the fifth test so that he can get the reward! ______________________________________ Let x be the numbers of 2 coin ,y be the numbers of 5 coins: x+y....=22 y=22-x ____________ 2x+5y>83 2x+5(22-x)>83 2x+110-5x>83 x..............>9 the maximum number of $2 coins is 10.
其他解答:
1. Two cars travelling in opposite directions at speeds 65 km/h and 60 km/h respectively meet on a straight road. After at least how many minutes will their minimum distance be 5 km? How long does the two cars ? 2. Tony got 67, 82, 78 and 86 marks in four mathematics tests. His father promised to take him to the Ocean Park as a reward if his average score in five tests is 80 marks or above. What is the minimum score that he should obtain in the fifth test so that he can get the reward? 80 x 5 - 67 - 82 - 78 - 86 = 400 - 313 = 87 He should get at least 87 marks 3. Dick has 22 coins. Each coin is either a $2 coin or a $5 coin. The total value of the coins is more than $83. Find the maximum number of $2 coins that Dick has. Answer : 9A215E4A2B88AAE64
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