math(要例式)快快快,有10分
2006-10-21 9:42 pm
sophia is 28 years younger than dick.gary is 1/4 the agr of sophia.maria is 18 years older than gary.if maria is 28,how old is dick?
回答 (4)
2006-10-21 9:51 pm
✔ 最佳答案
sophia= xdick=x+28
gary=x/4
maria=18+x/4=28
x=40
dick = 38
2006-10-21 10:17 pm
let G be age of gary, M be age of maria, D is age of dick, S is age of sophia
S+28=D
G=S/4
M=G+18
when maria is 28
M=28=G+18
G=28-18
G=10
G=10=S/4
S=10*4
S=40
S+28=D
40+28=D
D=68
therefore dick is 68 years old.
S+28=D
G=S/4
M=G+18
when maria is 28
M=28=G+18
G=28-18
G=10
G=10=S/4
S=10*4
S=40
S+28=D
40+28=D
D=68
therefore dick is 68 years old.
2006-10-21 9:59 pm
Let x be the age of dick
(x-28)/4+18=28
(x-28)/4=10
x-28=40
x=68
The age of dick is 68.
(x-28)/4+18=28
(x-28)/4=10
x-28=40
x=68
The age of dick is 68.
2006-10-21 9:56 pm
Let the age of Dick be a years old
Let the age of Sophia be b years old
Let the age of Gary be c years old
a = b + 28
c = ¼ b
c = 28 - 18 = 10
10 = ¼ b
40 = b
a = b + 28 = 40 + 28 = 68
Ans. Dick is 68 years old.
Let the age of Sophia be b years old
Let the age of Gary be c years old
a = b + 28
c = ¼ b
c = 28 - 18 = 10
10 = ¼ b
40 = b
a = b + 28 = 40 + 28 = 68
Ans. Dick is 68 years old.
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