Question:
a girl at his 20th birthday bought a piggy bank and save RS.250 every year but her sister take RS 50 from his piggy bank every year she save RS.till she get 60 years and the money left is 500 . how?
Answer:
Elder sister birthday must be on Feb 29 of a leap year.
So in all the 40 years from after her 20th birthday to 60th birthday she celebrated birthday only for 10 times. and for 10 times she had put Rs 250,
So total amount she saved is Rs 2500
But younger sister should be celebrating her birthday every year having birthday on any normal day. So she celebrated every one of 40 years from her elder sisters
20th to 60th birthday. And every year she removed 50 Rs from her sister savings which mean she took 50 Rs for 40 times. that means she took total 2000 from
that means she took total 2000 from her elder sister savings.
So, at last it is just 500 Rs remaining.
Note: Elder sister birthday must be on Feb 29 of a leap year because only this way, we can calculate the remaining things according to questions.
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