One year ago a mother was 4 times older then her son. After 6 years, her age becomes more than double her sons age by 5 years. The present ratio of their age will be
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 ?
frank
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