Bob is five years older than his sister Elva.  The sum of their ages is 33.  How old is Elva?
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Bob is five years older than his sister Elva. The sum of their ages is 33. How old is Elva?

B = E + 5
B + E = 33
(E + 5) + E = 33
2E + 5 = 33
2E = 28
E = 14

Elva is fourteen years old.
by Level 11 User (78.4k points)

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