Jodie bought some shirts for $6 each marge bought some shirts for $8 each the girls spent the same amount of money on shirts what is the least amount they could have spent

All this is asking you to do is find the LCM (least common multiple) of 8 and 6. So if you list them out this is what you get:
6: 6,12,18,24
8:8,16,24,32
So you can see that the multiple 24 is common between them. Now just add the two together and you have your  48$

Im really not good at this but I did 6x8 which is 48

Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction