numerical & proportional reasoning
posted by sam on .
each summer, a high school sponsors a picnic for new students, their parents and teachers. last year, 65 pounds of hamburger patties were cooked to serve b/w 250 and 300 people. this year the school expects between 325 & 375 people.
estimate the number of punds of hamburger patties that should be ordered.

average of 250 and 300 = (250+300)/2 = 275
so we ordered 65 lbs for 275 people on the average or
65/275 = .236 lbs/person (less than 1/4 lb ? = wicked cheap)
his year we expect an average of (325+375)/2 = 350 people
if we order .236 lbs / person we must order
.236 * 350 = 82.6 pounds