Three years ago mary was three times as old as her sister now mary is twice as old as her

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The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?

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Latest exam Aptitude Question SOLUTION: three years ago mary was three times as old as her sister. now mary is twice as old as her sister. how old is mary now. please show work

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(#M40106586) EXAM Numerical Ability question Keep an EYE

three years ago mary was three times as old as her sister. now mary is twice as old as her sister. how old is mary now.
please show work

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