If 15th of February 1789 is Friday what will be the day of 15th of February 1790? 

Four runners started running simultaneously from a point on a circular track. They took 200 seconds, 300 seconds, 360 seconds and 450 seconds to complete one round. After how much time do they meet at the starting point for the first time? 

Time appears in the mirror 6: 00. Then what is the correct time in clock? 

The number which can be written in the form of n (n+1) (n+2), where n is a natural number, is: 

While solving a problem, by mistake, Anita squared a number and then subtracted 25 from it rather than first subtracting 25 from the number and then squaring it. But she got the right answer. What was the given number? 

Prashant's monthly income is 30% more than that of Vimal. Vimal's monthly income is 20% less than that of Abhishek. If half of the value of the difference between the monthly income of Prashant and Abhishek is Rs.1800, what is the monthly income of Vimal? 

What is the sum of all natural numbers between 100 and 400 which are divisible by 13? 

Nathu and Buchku each have certain number of oranges. Nathu says to Buckhu, " If you give me 10 of your oranges, I will have twice the number of oranges left with you “. Buckhu replies, " If you give me 10 of your oranges, I will have the same number of oranges as left with you." What is the number of oranges with Nathu and Buckhu , respectively ?