Sagot :
sleeping bag⇒S
backpack⇒B
S=8 pounds
S+B=31
8+B=31
B=31-8
B=23 pounds
Answer: 23 pounds
backpack⇒B
S=8 pounds
S+B=31
8+B=31
B=31-8
B=23 pounds
Answer: 23 pounds