One small .5 kg package of cheese contains 2000 cal. How many calories are contained in a large 13 kg package?

Answer 1

Set this up as two fractions that are equal to each other because it's a ratio. So, .5/2000 = 13/x. Then, solve for x by cross multiplying (some teachers refer to it as a butterfly). So you would have .5x = 2000*13. Multiply and then divide to find your final answer for x.