Jason gave away a third of his collection if hockey cards. if he gave away 360 hockey cards how many does he have left?

360 x 3 = 1080 ( this is how much he started with)
360 x 2 = 720 ( 2/3 of what he had)
720 ( what he has left)

360*3=1080.  so he started with 1080 cards.  1080-360=720

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!