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Answer:
The parent age is 53 years
PLESSE MARK AS BRAINLIST
Verified answer
Answer:
elder sister age=35
small sister age=25
Step-by-step explanation:
let elder be x
and younger be y
x-y=10
15 years ago
elder=x-15
younger=y-15
elder is twice old as younger 15 years ago
x-15=2(y-15)
x-15=2y-30
x+15=2y
y=x+15/2
x-y=10
x-(x+15/2)=10
x-15=20
x=35