Home Brain Teasers Brain Teaser – November 11Brain Teasers Brain Teaser – November 11By Medical News Bulletin - November 11, 2018 Reading Time: 1 minuteDr. Johnson spends one-fifth of the money in his wallet. He then spends one-fifth of what remains in the wallet. He spends $36.00 in all. How much money did Dr. Johnson have to begin with?See the answerAnswer:$100Let M be the initial amount of money in his wallet. Then 1/5M+1/5(M-1/5M)=36. Hence, 1/5M+1/5×4/5M=36 or 1/5M+4/25M=36.Multiplying both sides by 25, we get 5M+4M=36×25 or 9M=900.Therefore, M=100 Facebook CommentsHow much did this article help your understanding of this health condition? 0 = Not at all, 5 = Very helpful 0 1 2 3 4 5 RELATED ARTICLESMORE FROM AUTHORBrain Teaser – February 25Brain Teaser – February 22Brain Teaser – February 18Connect With Us* Indicates RequiredYour Name Email Address* Be the first to know about the latest medical and health research. Subscribe to our weekly newsletter.