let

x = the number pf paperclips Antonio has

y = the number of paper clips that Abby has

Antonio and Abby had the same number of paperclips

x = y

after Antonio gave 30 paperclips to Abby, Abby had twice as many paperclips as Antonio

y + 30 = 2*(x - 30)

that is x + 30 = 2x - 60

x = 90 paperclips

they had 2*90 = 180 paperclips in all.