Colette packed 220f cookies into 12 small boxes and some big boxes. In each small box, there were 10 cookies. How many big boxes did she use if she packed 15 cookies in each big box.whats the answer

Answer 1

12 small boxes, each with 10 cookies gave a total of 12x10 = 120 cookies

220-120 = 100 cookies left for the big boxes

with 15 cookies per big box, 100/15 = 20/3 = 6 2/3 boxes. She needed at least 7 large boxes

6 full large boxes with 90 total cookies and a 7th box with just 10 cookies

or 7 boxes with 100/7 = 14 2/7 per box on average, 15 in 2 boxes and 14 in 5 boxes 15x2 + 14x5 = 100