Question

kanika was given her pocket money on Jan 1,2008.she puts Re 1 on day ,Rs2 on day2,Rs 3 on day3 and continued doing so till the end of the month,from this money into her piggy bank .she also spent rs204 of her pocket money and found that at the end of the month she still had rs 100 with her.how much was her pocket money for the month?

Answer 1

rupees she put into her piggy bank is n(n+1)/2 where n is number of days . hence total money in piggy bank at the end of the month is 496.and she spend 204 but then even have3 1000 rupees .hence total rupees are 4496+100+204=800