Question

Ulani has two sisters. Ulanis older sister is twice her age plus one. Her younger sister is 3 years less than ulanis age. What is ulsnis age if their sum of she's equals 26?
If their ages are
younger sister: x
Ulani: y
elder sister: z

then we have

z = 2y+1
x = y-3
x+y+z = 26

(y-3) + y + (2y+1) = 26
4y-2 = 26
y = 7

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