First find the number of calories in the carrots: 50 calories * 2 = <<50*2=100>>100 calories
Then find the total calories in the salad: 100 calories + 50 calories + 210 calories = <<100+50+210=360>>360 calories
Then find the number of calories in the pepperoni: 1/3 * 600 calories = <<1/3*600=200>>200 calories
Now find the total number of calories in the pizza: 200 calories + 600 calories + 400 calories = <<200+600+400=1200>>1200 calories
Now find how many calories are in Jackson's portion of the salad: 360 calories * 1/4 = <<360*1/4=90>>90 calories
Now find how many calories are in Jackson's portion of the pizza: 1200 calories * 1/5 = <<1200*1/5=240>>240 calories
Now find the total calories Jackson ate: 90 calories + 240 calories = <<90+240=330>>330 calories
#### 330