Khadija is thrice as old as her daughter. The sum of their ages is 45. What is her daughter's age?
Answer: 12 years
Explanation
Khadija is thrice as old as her daughter, so:
K = 3D
The sum of their ages is 45:
K + D = 45
3D + D = 45
4D = 45
D = 45/4
D = 11.25 (12)
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