- 在線時間
- 46 小時
- 最後登錄
- 12-10-10
- 國民生產力
- 23
- 附加生產力
- 42
- 貢獻生產力
- 0
- 註冊時間
- 06-9-21
- 閱讀權限
- 10
- 帖子
- 190
- 主題
- 23
- 精華
- 0
- 積分
- 255
- UID
- 101842
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Total = "T", Last month sales = "LS"
(a) T/2 + 7 = LS
(b) (T-LS)/2 + 18 = 42
From (b) (T - LS) = (42 -18) * 2
LS = T - (42 - 18) * 2
LS = T - 48
Sub the result above to (a),
T/2 + 7 = T - 48
T = (T - 48 - 7) * 2
T = 2T -55
T = 110
Total = 110, Last month sales = 62
上月餘下顏色筆多少盒? = 110 - 62 = 48 |
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