Bubble gum comes in packs of 6, 9 and 20 pieces. Therefore, it is possible to purchase exactly 15 pieces of bubble gum but impossible to purchase exactly 14 pieces. It is also impossible to purchase exactly 1, 2, 3, 4, 5, 7, 8, 10, 11, 13, 16, 17, 19, 22, 23 and 25. What positive integer quantities greater than 25 yet less than 500 are impossible to exactly purchase?
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6x+9y+20z
plug in numbers and make sure the outcome meets ur criteria
plug in numbers and make sure the outcome meets ur criteria
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See your teacher!