Data for a certain biology experiment are given in the table above. If the amount of bacteria present increased by the same fraction during each of the two 3-hour periods shown, how many grams of bacteria were present at 4:00 P.M.?
这道题应该大家都见过,我就是疑惑,这里的fraction是增加量还是增加比例,答案是增加比例,但是我理解的是增加量
谢谢各位指教
increased by the same fraction,按比例增加。
这个你可以这么理解,这个月你100斤,下个月你120斤,增加的量是20,百分比是120-100/100=20%。
第三个月按比例增加20%,这时是120×120% = 144斤,而按你说的相同增加量来看的话第三个月应该是140斤,差别就在于比例的分母是不一样的。