Inequalities in One Unknown－aptzmcv的部落格

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Inequalities in One Unknown

發問:

The weight of Mary is x kg.John is 10kg heavier than Mary while Yvonne is 5kg lighter than Mary.(a) Express the weight of John and Yvonne in terms of x(b) Mary,,john and Yvonne are going to enter a lift in which there are 4 people of weights 36 kg,42kg,53kg and 73kg respectively.Suppose the maximum load of the... 顯示更多 The weight of Mary is x kg.John is 10kg heavier than Mary while Yvonne is 5kg lighter than Mary. (a) Express the weight of John and Yvonne in terms of x (b) Mary,,john and Yvonne are going to enter a lift in which there are 4 people of weights 36 kg,42kg,53kg and 73kg respectively.Suppose the maximum load of the lift is 350kg,find the maximum weight of Mary such that the lift will not be overloaded.

最佳解答:

(a) The weight of John is (x+10)kg and Yvonne is (x-5)kg (b) (The weight of Mary,John,Yvonne and the others should not greater than 350kg ) So, x+(x+10)+(x-5)+36+42+53+73<=350 x+x+10+x-5+36+42+53+73<=350 3x<=141 x<=47 Therefore, the maximum weight of Mary is 47kg so that the lift will not be overloaded.. Hope I can help you :)

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