vi

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Phổ biến Word Problems >

Dan is twice as old as Bob. The sum of their ages seven years ago was 13. How old are they now

Lời Giải

D an i s tw i ce a s o l d a s B o b . T h e s u m o f t h e i r a g es se v e n ye a rs a g o w a s 13. Ho w o l d a re t h ey n o w

Lời Giải

Bob^{'} s age is : 9

Dan^{'} s age is : 18

Các bước giải pháp

Translate the problem into an equation:

2 x - 7 + x - 7 = 13

Giải

x, 2 x - 7 + x - 7 = 13 : x = 9

Tìm age

Bob^{'} s age is : 9

Dan^{'} s age is : 18

Ví dụ phổ biến

how many roups of 6 can you make out of 9 The chu vi of a circle is 2𝜋 inches. What is the radius The sum of 4 consecutive even integers is 44. What is the least of the 4 integers?You deposit 5000 in an account earning 6% interest compounded continuously. How much will you have in the account in 15 years?Fifteen subtracted from the quotient of a number and four is seventeen.