vi

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Phổ biến Word Problems >

A Father is twice as old as his son. Twelve years ago the father was four times as old as the son was then. Determine their present ages.

Lời Giải

A F a t h er i s tw i ce a s o l d a s hi s so n . Tw e l v e ye a rs a g o t h e f a t h er w a s f o u r t im es a s o l d a s t h e so n w a s t h e n . De t er min e t h e i r p rese n t a g es .

Lời Giải

Boy^{'} s age is : 18

Father^{'} s age is : 36

Các bước giải pháp

Translate the problem into an equation:

2 x - 12 = 4 (x - 12)

Giải

x, 2 x - 12 = 4 (x - 12) : x = 18

Tìm age

Boy^{'} s age is : 18

Father^{'} s age is : 36

Ví dụ phổ biến

Your dog is 10 years younger than your friend. In 4 years, your friend will be three times as old as your dog. How old is your dog now?Gerald is four more than twice the age of Tom. Tom is 49 years old. How old is Gerald?Alex is three times older than his brother now. In two years, he will be two times older than his brother. How old is his brother now?John is twice as old as his friend Peter. Peter is 5 years older than Alice. In 5 years, John will be three times as old as Alice. How old is Peter?A sofa is 12 years old and a table is 36 years old. In how many years will the table be twice as old as the sofa?