Question

x+2x+3x+4x+5x=1155

Answer 1

x+2x+3x+4x+5x=1155

=>x(1+2+3+4+5)=1155

=>x15=1155

=>x=1155:15

=>x=77

Answer 2

x+2x+3x+4x+5x=1056

=>x.(1+2+3+4+5)=1056

=>x.15=1056

=>x=1056:15

=>x=70,4

Answer 3

 

x+2x+3x+4x+5x=1056

=>x.(1+2+3+4+5)=1056

=>x.15=1056

=>x=1056:15

=>x=70,4