Re: Total Cost calculation

Not sure if this will make things more confusing or not.

Let be the cost of one lunch, we know and there are 3 lunches in total so

therefore the total cost must be $13 as none of the other options fit within the inequality.

Re: Total Cost calculation

if its for kids who haven't done inequalities before you could ask them to work out with you what the lowest possible cost is (3.95*3), then what the highest possible cost is (4.8*3), and then note that only $13 is a possible answer.

which is identical to the previous post, with a gentle introduction