P1-PS-42

[chiungfen]

42. 5722-!-item-!-187;#058&004704
Mark bought a set of 6 flower pots of different sizes at a total cost of $8.25. Each pot cost $0.25 more than the next one below it in size. What was the cost, in dollars, of the largest pot?
(A) $1.75
(B) $1.85
(C) $2.00
(D) $2.15
(E) $2.30

答案是(C)耶~~~

請位大大…這題怎麼解呀??

[Huang Hsin-Yi]

If the first pot is X dollar, then the second pot is X+0.25, then the third pot is X+0.5..........

[sunnyblue13s]

能把你的算式列出來嗎??

我再來幫你看看~~

[chiungfen]

好滴
我的式子是這8.25/6=1.375
so first pot is 1.375, then the second is 1.375+0.25...... the third is 1.375+0.25+0.25........
所以我把式子歸類一下，[1.375+(0.25*5)]=2.625，因為6個數子有5個間隔的0.25.

我想我的思路是錯嚕~~麻煩更正

[sunnyblue13s]

你題目的理解有問題，煩請你先把題目翻譯出來~~

[chiungfen]

設第一個POT 為X dollar, 共有6個

X+(X+0.25)+(X+0.5)+(X+0.75)+(X+1)+(X+1.25)=8.25

6x+3.75=8.25
X=0.75
所以最大的pot就是0.75+1.25=2.00
請問這樣算是否可行呢~~~ 謝謝嚕

[sunnyblue13s]

恭喜你囉~~你答對了~~