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题库 / GMATLA-PS-34
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.?
12.0
12.1
12.2
12.3
12.4
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increase x= 增长x
increase by x=增长x倍
increased by the same fraction
increase by
被自己蠢哭 ..解10/x=x/14.4
increase by 是增长x倍的意思！
代入法，最快～
by the same fraction ！！！
x=10* (1+n)，
x* （1+n）=14.4
n=0.2，x=1.2