@wonkywinky A Red Army tank platoon had either 2 or 3 tanks in it, depending on whether it was a heavy tank platoon or a medium tank platoon. So ISU-152s and IS-2s would have 2 per platoon and 5 per company, while T-34s, T-70s, Shermans, and whatever else had 3 per platoon and 10 per company (at full strength of course)
@KiwiDan Thanks its great you have done your research.I was assuming all would be like the Germans who had maybe up to 8 in a platoon.(you sometimes see photos of mainly MkIV numbered like 528-8th tank second platoon 5th company).