Question

the sum of number and one add one add to it multiplied by two is ten what is the number

Answer 1

Let the number be a

According to question,

(a +1)2 = 10

=> 2a +2 = 10

=> 2a = 8

=> a = 4

Required number = 4

Answer 2

Let the required number is ( k ),

According to the question :

=> ( k + 1 ) 2 = 10

=> k + 1 = 5

=> k = 5 - 1

$=> \textcolor{red}{required number = 4}$