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

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Question 280623: John is twice as old as his sister Mary. Mary's age is 1/6 of the age of her mother. Their mother is 30. How old are John and Mary?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
John Mary X=mother
J=2M
M=(1/6)X
X=30
M=5
J=10