HLP With steps Plz!!

Question

One vegetable warehouse had 210 tons of potatoes, another one had 180 tons. 90 tons of potatoes were delivered to the first warehouse every day and 120 tons to the second warehouse. In how many days will the first warehouse have 1.2 times less potatoes than the second warehouse? I need help! I know the answer, but don't know how to get to it.

Answer 1

Let D be the number of days it takes, so the first warehouse will hold 210+90D tons and the second 180+120D. So, 1.2(210+90D) = 180+120D -> 252+108D = 180+120D -> 144 = 12D -> 12 = D