Lizzy: At Esme's school, there are 30 teachers and 45 staff members. On a Monday morning, The Best Pizza Inn brought pizza for the staff and teachers as a promotion offer. If 2/3 of the teachers and 4/5 of the staff members ate Pizza, how many non-pizza eaters are at Esme's school?.
Me: Hmmm, let me think. I think this is the detailed solution:
The total number of teachers who ate pizza is 2 / 3 * 30 = 20. 30 - 20 = 10 teachers did not eat pizza. The number of staff members who ate pizza is 4 / 5 * 45 = 36. The number of staff members who did not eat pizza is 45 - 36 = 9. The number of non - pizza eaters is 9 + 10 = 19. Final answer: 19.