UKMT Grey Kangaroo, 2017

Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Olivia has 20 euros. Each of her four sisters has 10 euros. How many euros does Olivia need to give to each of her sisters so that each of the five girls has the same amount of money?

(A) $2$ (B) $4$ (C) $5$ (D) $8$ (E) $10$

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