Number System
The difference between the two digit number and the number obtained by interchanging its digits is 54. The difference between the digits is?

4
6
1
Nothing can be said.

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Number System
Radha's present age is three years less than twice her age 12 years ago. Also the respective ratio between Raj's present age and Radha's present age is 4 : 9. What will be Raj's age after 5 years ?

17 years
16 years
15 years
14 years

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