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標題:

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發問:

Question 1 :A fast food restaurant sold 102 sets of lunch today.If the number of set lunchessold today is 15% less than yesterday 's,find the number of set lunches sold in these two days. ( percentage question)Question 2:After cutting a rope by 14.6 m,its... 顯示更多 Question 1 : A fast food restaurant sold 102 sets of lunch today.If the number of set lunches sold today is 15% less than yesterday 's,find the number of set lunches sold in these two days. ( percentage question) Question 2: After cutting a rope by 14.6 m,its length decreases by 18.25%.Find the length of the remaining part of the rope. Question 3: In the first stage of a fitness programme,Mary lost 2 kg and her weight went down to 48 kg. What is the percentage decrease in her weight? Mary lost another 1.2 kg in the second stage. What is the percentage decrease in her weight in the second stage? Question 4: Andy's expenditure of this month is 10% more than that of last month.If he spend 2400 dollars last month,find his expenditure of this month. If the expenditure of this month is 40% of his earnings,find his earnings. 更新: Question 5: If the numerator of 2/5 increase by 50% and its denominator decreases by 20%,find the new fraction. 更新 2: Question 6: The length and width of a rectangular lawn are 200 m and 150 mm respectively.If the length and width decrease by 10% and 6% respectively, find the new area. find the percentage decrease in area. 更新 3: Question 7: The scores of team A and team Bwere the same at the beginningof a competition. After a round,the score of team A increased by 80,and that of team B increased to 240. 更新 4: If the score of team A increased by 40%,find the scores of the two teams at the beginning. Find the percentage increase in the score of team B. 更新 5: thank you 更新 6: thank you thank you thank you

最佳解答:

Question 1 : Number of set lunches sold yesterday = 102/(1 - 15%) sets = 120 sets Total number of set lunches sold in these days = (102 + 120) sets = 222 sets ===== Question 2: Length of the remaining part of the rope = (Original length of the rope) - (14.6 m) = (14.6/18.25% m) - (14.6 m) = (80 - 14.6) m = 65.4 m ===== Question 3: Percentage decrease in her weight = [2/(48 + 2)] x 100% = 4% Percentage decrease in the second stage = (1.2/48) x 100% = 2.5% ===== Question 4: His expenditure of this month = $2400 x (1 + 10%) = $2640 His earnings = $2640/40% = $6600 =

其他解答:

Question 1 : 102 = (1-15%)x yesterday yesterday = 102/85% = 120 total in 2 days = 102 + 120 = 222 Question 2: origin length x 18.35% = 16.4m origin length = 16.4m / 18.35% = 89.373297m remaining length = 89.373297m - 16.4m = 72.973297m Question 3: percentage decrease = 2/(2+48) (i.e. decrement/origin value) = 4% percentage decrease = 1.2/48 = 2.5% Question 4: expenditure of this month = 2400dollars x (1+10%) = 2640dollars earnings x 40% = 2640dollars earnings = 2640dollars / 40% = 6600dollars 2008-12-08 10:41:08 補充： sorry, question 2 I wrongly used 16.4 instead of 14.6, it should be: origin length x 18.35% = 14.6m origin length = 14.6m / 18.35% = 79.5640327m remaining length = 79.5640327m - 14.6m = 64.9640327m6CC7293C79127CE5