標題:
發問:
請盡量回答，需列清楚步驟，最詳細者便是最佳回答﹗1.Cathay Pacific(國泰航空公司)has 12 flights flying from Hong Kong to Auckland every week. If it plans to increase 4 flights per week, what percentage of flights is planned to increase per week?2.In general, 3% of a male adult's weight is the minerals in his body. If Mr Lee weights 80... 顯示更多 請盡量回答，需列清楚步驟，最詳細者便是最佳回答﹗ 1.Cathay Pacific(國泰航空公司)has 12 flights flying from Hong Kong to Auckland every week. If it plans to increase 4 flights per week, what percentage of flights is planned to increase per week? 2.In general, 3% of a male adult's weight is the minerals in his body. If Mr Lee weights 80 kg, find the weight of minerals in his body. 3.A container of butter weights 250 g, of which 3.5% is the weight of fats. What is the weight of fats? 4.Mrs Chan has bought 80 eggs. If 12.5% of the eggs are rotten,how many of them are fresh? 5.An alloy contains 40% tin by weight. Whatis the total weight of the alloy if the tin weights 90 g? 6.45% of the capacity of a beaker is 72ml . What is the capacity of the beaker? 唔該，要快。
最佳解答:
1) The percentage of flights is planned to increase per week: 4/12 x 100% = 33.33 % (correct to 2 d.p.) 2) The minerals in Mr. Lee body: 80 kg x 3% = 2.4 kg 3) The weight of fats: 250 g x 3.5% = 8.75 g 4) The number of rotten eggs: 80 x 12.5% = 10 i.e. The number of fresh eggs: 80 - 10 = 70 5) Let j be the total weight of the alloy: j x 40% = 90 g j = 225 g 6) Let k be the capacity of the beaker: k x 45% = 72 ml k = 160 ml
其他解答:
1. The increased % = (12+4-12)/12 × 100% ...... =(new number of flights - original number of flights)/original number of flights × 100% = 4/12 × 100% = 100/3 % 2. The weight of minerals in his body = 80 × 3% = 80 × 0.3 = 24 kg 3. The weight of fats = 250 × 3.5% = 250 × 0.35 = 87.5 g 4. The number of eggs which are fresh = 80 × (1-12.5%) ... original number of eggs × (original number of eggs - number of rotten eggs) = 80 × 87.5% = 80 × 0.875 = 70 (egg) 5. The total weight of the alloy = 90 × 40% = 90 × 0.4 = 36 g 6. Let x mL be the capacity of the beaker. x × 45% = 72 x = 72 ÷ 45% x = 72 ÷ 0.45 x = 160 The capacity of the beaker is 160 mL. 2008-12-06 21:16:25 補充： 5. is wrong The right one: Let x g be the total weight of the alloy. x × 40% = 90 ... (the weight of the alloy × 40% = the weight of tin) x = 90 ÷ 40% x = 90 ÷ 0.4 x = 225 The total weight of the alloy is 225 g. 2008-12-06 21:18:05 補充： 2. is wrong The right one: 80 × 3% = 80 × 0.03 = 2.4 kg|||||1) Percentage increase: 4/12x100% =1/3x100% =33 1/3% 2) The weight of minerals: 80x3% =2.4 kg 3) The weight of fats: 250x3.5% =8.75 g 4) The no. : 80x(1-12.5%) =80x87.5% =70 5) The total weight: 90/40% =225 g 6) The capacity: 72/45% =160 ml4E350C6F8B48ECA2
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中一數學題(超急)發問:
請盡量回答，需列清楚步驟，最詳細者便是最佳回答﹗1.Cathay Pacific(國泰航空公司)has 12 flights flying from Hong Kong to Auckland every week. If it plans to increase 4 flights per week, what percentage of flights is planned to increase per week?2.In general, 3% of a male adult's weight is the minerals in his body. If Mr Lee weights 80... 顯示更多 請盡量回答，需列清楚步驟，最詳細者便是最佳回答﹗ 1.Cathay Pacific(國泰航空公司)has 12 flights flying from Hong Kong to Auckland every week. If it plans to increase 4 flights per week, what percentage of flights is planned to increase per week? 2.In general, 3% of a male adult's weight is the minerals in his body. If Mr Lee weights 80 kg, find the weight of minerals in his body. 3.A container of butter weights 250 g, of which 3.5% is the weight of fats. What is the weight of fats? 4.Mrs Chan has bought 80 eggs. If 12.5% of the eggs are rotten,how many of them are fresh? 5.An alloy contains 40% tin by weight. Whatis the total weight of the alloy if the tin weights 90 g? 6.45% of the capacity of a beaker is 72ml . What is the capacity of the beaker? 唔該，要快。
最佳解答:
1) The percentage of flights is planned to increase per week: 4/12 x 100% = 33.33 % (correct to 2 d.p.) 2) The minerals in Mr. Lee body: 80 kg x 3% = 2.4 kg 3) The weight of fats: 250 g x 3.5% = 8.75 g 4) The number of rotten eggs: 80 x 12.5% = 10 i.e. The number of fresh eggs: 80 - 10 = 70 5) Let j be the total weight of the alloy: j x 40% = 90 g j = 225 g 6) Let k be the capacity of the beaker: k x 45% = 72 ml k = 160 ml
其他解答:
1. The increased % = (12+4-12)/12 × 100% ...... =(new number of flights - original number of flights)/original number of flights × 100% = 4/12 × 100% = 100/3 % 2. The weight of minerals in his body = 80 × 3% = 80 × 0.3 = 24 kg 3. The weight of fats = 250 × 3.5% = 250 × 0.35 = 87.5 g 4. The number of eggs which are fresh = 80 × (1-12.5%) ... original number of eggs × (original number of eggs - number of rotten eggs) = 80 × 87.5% = 80 × 0.875 = 70 (egg) 5. The total weight of the alloy = 90 × 40% = 90 × 0.4 = 36 g 6. Let x mL be the capacity of the beaker. x × 45% = 72 x = 72 ÷ 45% x = 72 ÷ 0.45 x = 160 The capacity of the beaker is 160 mL. 2008-12-06 21:16:25 補充： 5. is wrong The right one: Let x g be the total weight of the alloy. x × 40% = 90 ... (the weight of the alloy × 40% = the weight of tin) x = 90 ÷ 40% x = 90 ÷ 0.4 x = 225 The total weight of the alloy is 225 g. 2008-12-06 21:18:05 補充： 2. is wrong The right one: 80 × 3% = 80 × 0.03 = 2.4 kg|||||1) Percentage increase: 4/12x100% =1/3x100% =33 1/3% 2) The weight of minerals: 80x3% =2.4 kg 3) The weight of fats: 250x3.5% =8.75 g 4) The no. : 80x(1-12.5%) =80x87.5% =70 5) The total weight: 90/40% =225 g 6) The capacity: 72/45% =160 ml4E350C6F8B48ECA2
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