Number Series Puzzles - 1

1.  What is the next number in the sequence given below ?

      1,4,9,16,25,36,?

A:-  49

         1
         1+3 = 4
         4+5 = 9
         9+7 = 16
         16+9 = 25
         25+11 = 36
         36+13 = 49.
          

2.  What number should replace the qustion mark ?             

     147,159,174,186,?
    
A:-   201

        147
        147+12 = 159
        159+15 = 174
        174+12 = 186
        186+15 = 201. 

3.  What number continues this sequence ?

     18,20,24,32,?

A:-  48

        18
        18+2 = 20
        20+4(2*2) = 24
        24+8(4*2) = 32
        32+16(8*2) = 48.