SOLUTION: John is twice as old as his sister Mary. Mary's age is 1/6 the age of her mother. Their mother is 30. How old are John and Mary?

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Question 280621: John is twice as old as his sister Mary. Mary's age is 1/6 the age of her mother. Their mother is 30. How old are John and Mary?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
j=2s
s=m/6
m=30
s=30/6=5
j=2*5=10