Djibo is 17 years old. Five years ago Djibo added his age with his sister's age and the sum was 35. How many years old is Djibo's sister today?
Age 5 years ago: 17 - 5 = <<17-5=12>>12
Sister's age 5 years ago: 35 - 12 = <<35-12=23>>23
Sister's age today: 23 + 5 = <<23+5=28>>28 years
Djibo's sister is 28 years old today.
#### 28