Data for a certain biology experiment are given in the table below. If the amount oof bacteria present increased by the same factor during each of the two 3-hour periods shown, how many grams of bacteria were present at 4:00 PM?
TIME | AMOUNT |
1:00PM | 10.GRMAS |
4:00PM | X GRAMS |
7:00PM | 14.4GRAMS |
(A) 12.0 (B) 12.1 (C) 12.2 (D)12.3 (E)12.4
제가 푼 바로는요,
변화량을 A로 놓고,
X = 10+A
14.4 = X + A
14.4 = (10 + A) + A, 2A = 4.4, A= 2.2
SO, 답은 12.2 로 했는데,
정답은 A입니다.
풀이에 의하면, X = 10*A, 14.4=A*A로 놓고 풀었는데요,
문제에서 어떤 부분 때문에 +A가 아닌 *A로 푸는게 맞을까요?