Just To Keep You Busy

Work out the numbers of A to G if...

A+B+C+D+E+F+G=340
3A+7B-4C-13D+E-6F+2G=219.25
2A-7B+9C-4D-3E+2F+3G=82
ABC=21,150
DE=1225.25
FG=3,145
BDF=11,544

Also C is the smallest number, and E is the biggest number. F is the middle number.