At rsm summer camp 100 students had enough food for a 30-days stay. after 2 days 40 new students joined the camp. after that 2 weeks passed and half of the students left the camp. how many additional days of food need to be ordered ?

Harry owes the bank money. to repay his debt, he paid $150 back to the bank each month. after 10 months, his remaining debt was $6900. what was the original amount of harry's debt? how long did it take harry to pay back his entire debt?