CREATE TABLE table_6428 ("Make/ Model" TEXT, "length" TEXT, "Year" FLOAT, "Numbers  ( Quantity Ordered ) " TEXT, "Fuel Propulsion" TEXT)

Which Numbers (Quantity Ordered) have a Fuel Propulsion of cng, and a Year smaller than 2008, and a Make/ Model of nabi 40-lfw?
SELECT "Numbers (Quantity Ordered)" FROM table_6428 WHERE "Fuel Propulsion" = 'cng' AND "Year" < '2008' AND "Make/ Model" = 'nabi 40-lfw'
SELECT "Numbers (Quantity Ordered)" FROM "table_6428" WHERE "Fuel Propulsion" = 'cng' AND "Make/ Model" = 'nabi 40-lfw' AND "Year" < '2008'