en

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular Word Problems >

Two numbers have a sum of 21 and a difference of 9. Find the smaller number.

Solution

Tw o n u mb ers ha v e a s u m o f 21 an d a d i ff ere n ce o f 9. F in d t h e s ma ll er n u mb er .

Solution

The smallest number : 6

Solution steps

Represent the numbers with

x and y

:

number 1 : x

number 2 : y

A.T.Q.:

x + y = 21

x - y = 9

x + y = 21, x - y = 9 : x = 15, y = 6

Select the smallest solution:

6

The smallest number : 6

Popular Examples

The circumference of a circle is 30.144 kilometers. What is the circle's area?Four consecutive integers add up to 390. What is the least of these integers?Maria is 7 years older than her brother Robert. In 2 years, Maria's age will be 4 times Robert's age 3 years ago. Find their present ages.48 less than twice a number The sum of 4 times a number and 2 equals 6