/brainliest/5 stars/heart(thx)! jimmy is going to pack his backpack for a trip. his backpack is 60 cubic litres. he has a pile of equipment that takes up 43 cubic litres and then he has his sleeping bag that takes up 23 cubic litres. let r be the amount of room left in his backpack. which equation could you use to determine if he has enough room in his backpack. a) r = 23 + 43 b) r = 23 + 43 + 60 c) 23 + 43 + r = 60 d) 23 + r = 60 + 43