The results of the particle-size analysis of a soil are as follows: Percent passing the No. 10 sieve = 100 Percent passing the No. 40 sieve = 80 Percent passing the No. 200 sieve = 68 The liquid limit and plasticity index of the minus No. 40 fraction of the soil are 40 and 12, respectively. Classify the soil by the AASHTO system.