Question

when 6 is added to a certain number, 15 is obtained. find out the number

Answer 1

$6 + x = 15 \\ x = 15 - 6 = 9$

Answer 2

Let the number be x,

According to the question,

x + 6 = 15
x = 15 -6

x = 9

Then,

9 is the required number.


I hope this will help you


-by ABHAY