Read the passage given below carefully and answer the following questions from (i) to (v):
Mr. Prabhakar went on a hiking with his family. He is a patient of renal failure. In the middle of the trip, he fell ill. He had leg cramps and experienced acidity with high blood pressure. He was immediately taken to a nearby hospital. Doctor prescribed him antacids and gave him injection for high Blood Pressure (BP). He advised Mr. Prabhakar to rest a while and eat healthy.
(iv) In a healthy adult, the initial filtrate in the kidneys is about:
(3)