i have a question . the question is as follows. Question 1: A company manufactures pencils in boxes of 6, 9, and 20. The boxes are sealed and the pencils cannot be sold loose. What is the largest number of pencils that a wholesaler cannot purchase using some combination of these boxes? Ans : 43 How do i solve this problem ? Do i have to use LCM ? LCM does not give the correct answer though. i am clueless and confused. any tips how to solve this ? question 2: you know, i have a circle. inside circle there is an equilateral triangle. inside equilateral triangle there is another circle. is there any relationship between inner and outer cirle. something like this ? radius of outer circle =2*radius of inner circle. is that correct ? i want to know what is the relationship between inner and outer circle ?