Your sister is now 57.
99
Let you be x years old now Let your sister be y years old now Right now: x+3 = y In 20 years you are x+20 and your sister is y+20 years old (y+20)=2x plugging in y from the first equation: [(x+3)+20]=2x x+23=2x x = 23 y = 23+3 = 26 To check, the answer if you are 23 now an your sister is 26 now in 20 years your sister will be 46 which is twice 23.
The boy is 18 and the girl is 9
28
12
99
49
98
If you mean "now you are 100 years old", then, my sister is now 98 years old, since she was 2 when I was 4.
If when you were 2 years old your sister was half of your age, you would have been 2 and she would have been 1. So she is one year younger than you. Thus now you are 100 she will be one year younger and aged 99.
When you were 4 she was 2. You were two years older than she was. So if you are now 100 she is 98
her sister is approximately 5 years, and 3 months old
You dont have to be a certaiin age. my little sister has an account and shes 8
She doesn't have a half sister.
49 years
Let you be x years old now Let your sister be y years old now Right now: x+3 = y In 20 years you are x+20 and your sister is y+20 years old (y+20)=2x plugging in y from the first equation: [(x+3)+20]=2x x+23=2x x = 23 y = 23+3 = 26 To check, the answer if you are 23 now an your sister is 26 now in 20 years your sister will be 46 which is twice 23.
The boy is 18 and the girl is 9