John had 75 fliers to post around town. Last week, he posted 1 over 5 of them. This week, he posted 2 over 5 of the remaining fliers. How many fliers has he still not posted?

John has 50 fliers remaining. If you think about it, he already put up 10 because John put up 1 over 5 and 2 over 5. So 75 - 10=65. Now, John put 1 over 5 of them. That is 1 x 5=5. Next, you subtract 65-5 and that is 60. John put 2 fliers over 5 of them so, that is 2 x 5, or 10. 60 - 10 is 50 fliers.