In order to have the least amount of each, you would need to purchase 2 packages of large plates. Here is the reasoning:
You can buy the following number of large plates and small plates:
Small: 8, 16, 24, 32, ...
Large: 12, 24, 36, ...
The smallest number that can be bought so you have an equal amount is 24 of each.
To get 24 large plates, you would need 2 packages.
bus a: 25 + 25= 50 minutes x 12 = 6:00
bus b: 35 +35= 70 minutes x 12 = 8:40
I'm guessing that the 2 in that is ^2? if so, it opens down.
the perimeter of the square is 4cm