vi

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Phổ biến Word Problems >

if john was four times as old as jerry 8 years ago, and if john will be twice as old as jerry 8 years from now,how old is john?

Lời Giải

i f j o hn w a s f o u r t im es a s o l d a s j erry 8 ye a rs a g o, an d i f j o hn w i ll b e tw i ce a s o l d a s j erry 8 ye a rs f ro m n o w, h o w o l d i s j o hn ?

Lời Giải

John^{'} s age is : 40

Các bước giải pháp

Translate the problem into an equation:

x - 8 = 4 (y - 8), x + 8 = 2 (y + 8)

x - 8 = 4 (y - 8), x + 8 = 2 (y + 8) : x = 40, y = 16

John^{'} s age is : 40

Ví dụ phổ biến

the number divided by 12 Five years ago, Angus was five times as Quinn was at that time. Four years from now, Angus will be twice as old as Quinn will be. What is Quinn's age now?550/22 is a square number find 2 consecutive odd integers such that 3 times the smaller is 12 more than the larger three times the sum of a number and 8 equals 2