It is known that a = 110 / 100 + 212 / 101 + 316 / 102 + 1220/110 Finding the integral part of a

It is known that a = 110 / 100 + 212 / 101 + 316 / 102 + 1220/110 Finding the integral part of a

A=110/100+212/101+316/102+…… 1220/110
=(1+10/100)+(2+10/101)+(3+10/102)+.+(11+10/110)
=(1+2+3+...+11)+(10/100+10/101+...+10/110)
=66+(10/100+10/101+...+10/110)>66+(10/110+10/110+...+10/110)=67
66+(10/100+10/101+...+10/110)<66+(10/100+10/100+...+10/100)=67.1
The integral part of a is 67