What is the modified torque (lb/ft) when the standard hp n/a?
CREATE TABLE "performance_and_riding_the_mt125_r" (
  "rpm" real,
  "standard_hp" text,
  "standard_torque_lb_ft" text,
  "standard_speed_6th_gear" text,
  "modified_speed_6th_gear" real,
  "modified_hp" text,
  "modified_torque_lb_ft" text
);
SELECT COUNT("modified_torque_lb_ft") FROM "performance_and_riding_the_mt125_r" WHERE "standard_hp"='n/a';