[word="30"] □
[word="30"] [□]
[word="30"] []
After 30 to 50 years , the initial capital investment in these projects is fully ammortized . The interviews , lasting from 30 to 60 minutes , measured the adolescents ' feelings about their own ethnicity and compared those with their attitudes and propensity toward taking drugs and their perceptions of drug use among peers . The number of titles involved was also relatively small - shipments of 30 to 50 kilos every three months or so , and the courier company took responsibility for customs clearance . A retrofitted bus emits from 30 to 90 percent fewer toxic emissions and fine particles than an older bus running standard equipment .