help! maths-algebra

2007-10-10 7:14 am
how to solve this :
Sophia is 28 years younger than Dick. Gary is 1/4 the age of Sophia.Maria is 18 years older than Gary.If Maria is 28,how old is Dick
要步驟,說明,最好係梗中文啦

回答 (5)

2007-10-10 7:27 am
✔ 最佳答案
設Sophia年齡是 x
Dick 年齡= x+28
Gary 年齡= x/4
Maria 年齡= x/4+18
現Maria 真正年齡 =28

所以
x/4+18=28
x/4=10
x=40
Sophia真正年齡 =40
Dick真正年齡 =40+28
=68
2007-10-10 7:40 am
設D為DICK的年歲,S為SOPHIA的年歲,M為MARIA的年歲,G為GARY的年歲
依題意得出以下四條方程式:
D - S = 28 --- (1)
G = S / 4 --- (2)
M - 18 = G --- (3)
M = 28 --- (4)

由(4)式 : M = 28
由(3)式 : G = M - 18 = 28 -18 = 10
由(2)S = 10 X 4 = 40
由(1)D = 28 + S = 28 + 40 = 68

所以DICK是68歲
2007-10-10 7:31 am
Let x be the age of Dick,

(1/4) (x- 28) = 28-18
x/4 - 7 = 10
x/4 = 17
x = 68

設 x 為 Dick的年齡

由於Sophia比Dick年輕28歲
所以 Sophia的年齡為 (x-28)

由於Gary的年齡為Sophia的年齡的1/4
所以Gary的年齡為 (1/4) (x-28)

由於Maria比Gary年長18歲和她的年齡是28歲
所以Gary的年齡是 (28-18)

因此,我們可以列出以下的方程式--

(1/4) (x- 28) = 28-18
參考: =]
2007-10-10 7:29 am
LET X BE Sophia

Gary=X/4
Dick=X+28
Maria=X/4+18

X/4+18=28
X/4=10
X=40

X+28=Dick
40+28=60

Dick=60 Years old
參考: ME...唔知有無錯..應該岩的
2007-10-10 7:28 am
當Dick係Y歲
咁Sophia就係(Y-28)歲
Gary係(Y-28)/4歲
Maria係(Y-28)/4+18歲

如果Maria係28歲, 咁即係:

(Y-28)/4+18 = 28
(Y-28)/4 = 10
Y-28 = 40
Y = 68

Dick係68歲...咁老既 - -
參考: 自己


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