Sagot :
QUESTION
My age this year is a multiple of 5, by next year it will be a multiple of 7. How old am I?
EXPLANATION
The multiples of 7
- 7 , 14 , 21 , 28 , 35 , 42 ,...
The multiples of 5
- 5 , 10 , 15 , 20 , 25 , 30 , 35,...
Focusing on the multiples of 5 and when added to 1 , the sum is present on the multiples of 7.
Now, I noticed that 20 is the possible answer.
Because when 20 is added by 1 or increased by 1 , the sum will become a multiple of 7.
ANSWER
- 20 years old
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