Question

The sum of two rational numbers is 1. If one of the numbers is
5/20
find the other.​

Answer 1

GIVEN :

• Sum of two rational number is 1
• one of the two number is $\sf{\frac{5}{20}}$.

TO FIND :

• Other number

SOLUTION :

Let another number be x.

$\sf\mapsto{x+ \dfrac{5}{20}=1}$

$\sf\mapsto{x\:=\:1\:-\:\dfrac{5}{20}}$

$\sf\mapsto{x\:=\:\dfrac{20-5}{20}=\dfrac{\cancel{15}}{\cancel{20}}=\dfrac{3}{4}}$

$\sf\implies{Another\:number\:is\:\dfrac{3}{4}}$

Answer 2

Answer :

• Other number is 3/4

Given :

• The sum of two rational numbers is 1
• One of the numbers is 5/20

To find :

• Other number

Solution :

Method : (1)

Given that,

The sum of two rational numbers is 1 and one of the numbers is 5/20 then,

• Let the other number be x

According To Question,

》x + 5/20 = 1

》x + 1/4 = 1

》x = 1 - 1/4

Cross multiplying we get,

》x = 4 - 1 / 4

》x = 3/4

Hence, Other number is 3/4

Method (2)

》5/20 + x = 1

》x = 1 - 5/20

Cross multiplying

》x = 20 - 5 / 20

》x = 15/20

》x = 3/4

Hence, other number is 3/4