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F.4 Math 題=.=
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The time (T min) required to bake a cake varies jointly as the weight (W g) of flour and the number of eggs (n) used.Find the percentage change in w if T is doubled and n is tripled. 有人識計嗎=.=?? 更新: 佢答案係decreased by 33.3% BO=.=
最佳解答:
T=kWn (where k is a real number) W=T/(kn) when T is doubled and n is tripled , W'=(2T)/(k(3n)) W'=2/3[T/(kn)]=2W/3 The decreased percentage =(W-W')/W *100% =(W-(2/3)W)/W *100% =33.3%
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