Today is khadija’s birthday. After one year, she will become two times as she was ten years ago. current age of Khadija?
A. 19
B. 20
C. 21
D. 22
let her age be x
after 1 year her age will be x+1=2(x-10)
x+1=2x-20
1+20=2x-x
x=21 years