SOLUTION: Joe ran short of cash. Deposited 200 in checking account. He needs cash to purchase a CD for $16.99 and a gift certificate for $25. He goes to ATM machine to access cash. The a

Question 178922: Joe ran short of cash. Deposited 200 in checking account. He needs cash to purchase a CD for $16.99 and a gift certificate for $25. He goes to ATM machine to access cash. The amount he can enter has to be a multiple of 20. How much money should Joe withdraw so that he will have enough for these two purchases?

I know how much money he needs to withdraw but don't know how to put in algebra terms
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
CD+gift cerficate is
:
16.99+25=41.99 amount needed. lets call this N
:
let cash withdrawn =C
:
C=20x where x is positive integers
:

:
there for x has to be the next positive integer which is 3
:
20(3)=60
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