Four friends have collected $60 to buy dog food for an animal shelter. the food will cost $150. how much more does each friend need to collect if they will each collect the same amount

a. 15.00
b.22.50
c. 37.50
d. 90.00

B because 150-60=90 and 90/4=22.5 and if you put 22.5 into money its 22.50

B.
150-60=90
This tells you how much the 4 friends still have to pay.
90/4=22.50
you divide the amount of money left that's not paid by the amount of friends.  This gives you $22.50.  This is the amount of money each friend needs to pay to reach their goal.