Maths

Tom is twice as old as Mary,but he is two years younger than Jim.What is Mary age if Jim will be twenty years old in two years time?

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1. Tom is twice as old as Mary,but he is two years younger than Jim.What is Mary age if Jim will be twenty years old in two years time?

Jim's age: 20-2=18 years old
Tom's age: 18-2=16 years old
Mary age:16/2=8 years old

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2. Mary is X yrs. old.
Tom is 2x.
Jim is 2x+2.
In 2 years:
Mary will be x+2.
Jim will be 2x+4.
2x + 4 = 20.
X = 8 = Mary's age now.

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