Jawabanmu

2014-05-30T13:56:37+07:00
15+18+21+24+27+30+33+36+39+42+45+48+52+55+58 =485
1 1 1
2014-05-30T13:56:56+07:00
15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 .... 
jumlahnya yaitu 540 .....