Question

Mike can buy red push pins in packages of 10 and yellow push pins in packages of 12 what is the least amount of packages of each color he must buy in order to have the same number of pins

Answer 1

Well, you know that the only time a multiple of 12 reaches a multiple of 10 is when the ones digit place is 0. In this case, it's 60. So a minimum a 5 can be bought for the yellow pins and 6 red pins are bought to equal the total