Write an algebraic expression to evaluate each word problem.
Molly collected 81 shells in the first 5 days in 10 days at the beach. She collected y shells in the last 5 days. If Molly
collected 31 shells in the last 5 days, how many shells did she collect altogether at the beach?
a.
81-y; she collected 50 shells altogether.
b. 81+y; she collected 112 shells altogether.
she collected 50 shells altogether.
81y; she collected 112 shells altogether.
Please select the best answer from the choices provided
B