jackchung asked in 社會與文化語言 · 1 decade ago

GMAT-data sufficiency (數學-6)

The estimated amount in the price list rounded to 1$. How much is the sum of

the estimated amounts within 6$ of the sum of the actual amounts in the list.

(1) There are fewer than 11 amounts in the list.

(2) Each estimated amounts is 5$

上面是問題,答案有ABCDE。A指只有(1)選項符合題目且能得到答案。B指指有(2)......。C指要兩者即(1)+(2)才能得到答案。D指認一者都可得到答案即either (1) or (2) 但是非(1)+(2)。E指這兩個選項都沒辦法得到答案(無解)

Update:

你第二個選項的解釋看不太懂耶

1 Answer

Rating
  • Thomas
    Lv 6
    1 decade ago
    Best Answer

    取 round 到 1$

    => 每一筆誤差 小於 0.5$

    (1) 11筆

    => 誤差 < 0.5$*11 < 5.5$

    => 誤差 within 6$

    => 可得知 the sum of the estimated amounts within 6$ of the sum of the actual amounts in the list.

    @@@@@@@@@@@

    5.4$ 有 20 筆 (符合 (2))

    所以

    誤差有 0.4$*20=8 > 6, 不符合結果

    所以

    (2) 不選

    2008-03-27 16:03:50 補充:

    答案 A

    2008-03-27 17:46:34 補充:

    因為

    (2) =>

    可以算出 How much is the sum of

    the estimated amounts within 6$ of the sum of the actual amounts in the list.

    故 只要找一組值 符合 (2), 但導不出 結論

    即可說 (2) => 可以算出 How much ..... 不成立

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