In an examination, 65% of the total examines passed. If the number of failures is 420, the total number of examines is
Let the total number of examines = Z
Percentage of examines failed = (100 – 65) % = 35%
∴ 35% of Z = 420
⇒ Z × 35/100 = 420
⇒ Z = 420 × 100/35
⇒ Z = 12 × 100
⇒ Z = 1200