Courtney liked to collect marbles.  She kept them in mason jars.  One jar had 80 marbles.  Her second jar had twice that amount.  She just started her third jar which currently has 1/4 the amount of her first jar.  How many marbles does she have in total?
One jar had 80 and the second jar had twice that amount so 2*80 = 160 marbles
The third jar had 1/4 of the first jar's 80 marbles so it had .25*80 = <<1/4*80=20>>20 marbles
When you add up all the jars, she had 80+160+20 = <<80+160+20=260>>260 marbles
#### 260