Problema Solution
at vickys grocery store the cost of of a bag of ice varies directly with the weight of the ice.if a 7 pound bag of ice costs 0.86; what equation can be used to find how much a 20 pound bag cost?
Answer provided by our tutors
let
c = the cost of a bag of ice
m = the weight of the ice
c = k*m, where k is a constant we need to find
a 7 pound bag of ice costs 0.86 that is
0.86 = k*7 divide both sides by 7
k = 0.86/7
the equation is
c = (0.86/7)*m
we need to find c when m = 20 lbs
c = (0.86/7)*20
c = $2.457
20 pound bag costs $2.457.