if x/y=3/4 .the value of  (6/7+y-x/y+x) is

The sum of the squares of the first 15 positive integers (1² + 2² + 3² + . . . + 15²) is equal to 1240.  What is the sum of the squares of the second 15 positive integers (16² + 17² + 18² + . . . + 30²)?

If 76 is divided into four parts proportional to 7, 5, 3 and 4, the smallest part is