human
Brittany, Alex, and Jamy all share 600 marbles divided between them in the ratio 3:5:7. If Brittany gives Alex half of her marbles, what's the total number of marbles that Alex has?
assistant
How many marbles are there in total? ** The total ratio representing the number of marbles is 3+5 +7 = <<3+5+7=15>>15
How many marbles does Brittany have? ** From the ratio, the fraction representing the number of marbles that Brittany has is 3/15, which is equal to 3/15*600 = <<3/15*600=120>>120 marbles.
How many marbles does Alex have? ** Alex has 5/15*600 = <<5/15*600=200>>200 marbles.
How many marbles does Alex receive? ** If Brittany gives half of her marbles to Alex, Alex receives 1/2*120 = 60 marbles.
What is the total number of marbles that Alex has? ** After receiving 60 marbles from Brittany, Alex has 200+60 = <<200+60=260>>260 marbles.
#### 260