Answer:
10
Explanation:
If Daisy is originally 5 years old, then Olivia would be three times her age which is 15 years old.
After 5 years pass, Daisy will be 10 years old and Olivia will be 20 years old, making Olivia twice as old as Daisy now.
Daisy is 5 years old NOW
D=Daisy's age, O=Olivia's age
O=3D
O+5=2(D+5)
O+5=2D+10
O=2D+5
2D+5=3D
D=5
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