formulate the following equality problem:

MINIMIZE: $10$Xa$1+3$Xa$2+5$Xb$1+2$Xb$2$

subject to:

$10$Xa$1+3*$Xa$2<=1700$

$5$Xb$1+2*$Xb$2<=400$

Xa$1+$Xb$1>=120$

Xa$2+$Xb$2>=380$

Xa$1,$Xa$2,$Xb$1,$Xb$2>=0$