Question

when i subtracted 11 from twice a number and add 3 to it i get 21

Answer 1

Let, the number be x

According to the question,

(2x-11) +3 = 21
2x-11=21-3
2x= 18+11
2x= 29
x=14.5

Answer 2

let the number be x
2x-11)+3= 21
2x -11=21-3
2x-11=18
2x=18+11
2x=29
x=29÷2
=14.5
14.5×2=29
29-11= 18 -3= 21
21=21
LHS=RHS