Re: [計量] 請教兩題計量
※ 引述《yecochi (可恨有機 禁止裝死遊戲)》之銘言：
: 請教兩題計量from OG
: GR92-2 sec2
: 14. A 20-foot ladder leaning against a vertical wall with the
: base of the ladder 10 feet from the wall is pulled 2 feet farther out from
: the wall, causing the top of the ladder to drop x feet.
: col.A x
: col.B 2
: ans:B
: 不知道要怎麼算
梯子靠在垂直的牆上，所以梯子跟牆形成直角三角形的兩邊
原先梯子腳離牆 10 feet => 20, 10, y 的直角三角形 => y = 3√10
後來梯子腳又遠離牆 2 feet，所以高度會下降些，變成 20, 12, z的直角三角形
=> z = 16
y - z = x 大約是1.x
故B大
: 28.
: A window received 1/3 of her husband's estate, and each of her three sons
: received 1/3 of the balance. If the window and one of her sons received a
: total of $60000 from the estate, what was the amount of the estate?
: A. $90,000
: B. $96,000
: C. $108,000
: D. $135,000
: E. $180,000
: ans:C
: 題目看不太懂說
: 有請高手賜教了，謝謝!!!
應該是 widow
寡婦接受丈夫 1/3 的遺產，三個兒子平分剩下的 2/3
寡婦跟一個兒子總共拿到 60000，問遺產有多少
設遺產x 1/3x + 2/3x*1/3 = 60000 => x = 108,000
C
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