I really like such kind of number tricks.Well done umer.First one is really easy and second one is little bothering.

a+b+c+d+e = 30

incorporating information

(2b-1)+b+c+(b+1)+e = 30

i.e 4b+c+e = 30
again incorporating information

4b+14 =30......... people on this forum are wise enough to solve the remaining