Ali is 16 years old and his sister is 4 times his age. How many years back was Ali’s sister half of Ali’s age?
- 56 years
- 64 years
- 112 years
- 48 years
Explanation
Step 1: Present ages
-
Ali = 16 years
-
Sister = years
Step 2: Let x years ago
-
Ali’s age =
-
Sister’s age =
Condition: Sister was half of Ali’s age
Step 3: Solve
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