Alyssa is 3 years older than Gladys. William is twice as old as Alyssa. Altogether their ages total 89. How old is Gladys?

Let Gladys age be G, Alyssa age be A and William age be W

A= 3+G

W= 2(3+G)

their total age is 89, Therefore we add them

G+3+G+ (2(3+G))=89

G+3+G+6+2G=89

4G+9=89

4G=89-9

4G=80

G=80/4

G=20

Gladys (G) is 20 years old

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