A box contains 100 colored chips; some are pink and some are blue. Milton chooses a chip at random, records the color, and places it back in the bag. Milton has recorded 12 pink chips and 18 blue chips. Using these results, what is the predicted number of pink chips in the box?

So milton picked up 30 chips and of these 12 were pink. 12/30 were pink. To make 30 to 100 we multiply by 3.3333. We must also multiply the top number of the fraction as well. So 12*3.333=40 and 30*3.333=100. So you can estimate that the total number of pink chips in the box is 40