Question 54284
Units from B=x
Units from A=x+472
Total number of units=854
Problem to solve:
x+(x+472)=854
2x+472=854
2x+472-472=854-472
2x=382
2x/2=382/2
x=191
The units from B:{{{highlight(x=191)}}}
You didn't ask, but  
The Units from A:x+472=191+472=663
Happy Calculating!!!