Answer to Question #89852 in Algebra for Melis

Question

David has $200 in the bank. He bought a present for his mother for 1/2 of this amount and spent 1/2 of the remainder on some books. How much does he have left?

Answer 1

Let n be the initial amount of David:

$$n=200$$$

then the balance is:

$$k=(n-1/2*n)*1/2=1/4n=200/4=50$$$

Answer:50$