Question

Half of a number added to 10 gives 20. find the number

Answer 1

let that number be x.

x/2+10=20
x/2=20-10
x/2=10
x=10*2
x=20

the number is 20

Answer 2

the number is x
x / 2 + 10 = 20
x+20 =40
x=20