Brad 發問時間: 科學數學 · 3 年前

GRE計量多選題問題?

A rectangular playing field with a perimeter of 140t+10 feet has length 40t feet, where 10 <= t <= 12. Which of the following values could be the width, in feet, of the field? indicate all such values.

(A)300

(B)325

(C)340

(D)370

(E)375

求解跟思考過程

1 個解答

評分
  • 匿名使用者
    3 年前
    最佳解答

    For rectangle, perimeter = 2 × (length + width)

    140t + 10 = 2 × (40t + width)

    70t + 5 = 40t + width

    width = 30t + 5

    10 ≤ t ≤ 12

    30 × 10 + 5 ≤ width ≤ 30 × 12 + 5

    305 ≤ width ≤ 365

    (B) and (C) are possible.

還有問題?馬上發問,尋求解答。