zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的 Word Problems >

A mother is currently 10 times older than her son. In 4 years time, she will be 7 times older than her son. Use 换元法 to find answer.

解答

A m o t h er i s c u rre n tl y 10 t im es o l d er t han h er so n . I n 4 ye a rs t im e, s h e w i ll b e 7 t im es o l d er t han h er so n . U se s u b s t i t u t i o n t o f in d an s w er .

解答

Boy^{'} s age is : 8

Mother^{'} s age is : 80

求解步骤

Translate the problem into an equation:

10 x + 4 = 7 (x + 4)

求解

x, 10 x + 4 = 7 (x + 4) : x = 8

找到 age

Boy^{'} s age is : 8

Mother^{'} s age is : 80

流行的例子

21.Pamela is 14 years younger than Jiri. The sum of their ages is 30. What is Jiri's age?Nabria’s age is 8 years less than 5 times her brother’s age. Nabria’s age is 10 minus her brother’s age. How old is Nabria?Kevin is 3 times as old as Daniel. 4 years ago, Kevin was 5 times as old as Daniel.How old is Daniel now?A man is four times as old as his son. Six years ago the man was ten times as old as his son.Tyler is nine years older than his sister Tina. Twelve years ago, Tyler was four times as old as Tina. Find their ages now.