In how many ways can a zav impart midras impurity to a lying/riding surface?
Halacha 1 states that a zav imparts impurity in five ways: by standing, sitting, lying, hanging, or leaning on the object.
Question 2
In how many ways does a midras-impure object impart impurity to a person?
Halacha 1-2 explains: objects on which one lies or rides impart impurity in seven ways — the five of the zav, plus touching and carrying.
Question 3
What threshold of body support is needed for a zav to impart midras impurity?
Halacha 2 rules: 'A zav does not impart impurity to an object upon which one lies until the majority of his body is supported by the object.'
Question 4
If a zav is riding an animal and there are four surfaces under its four feet, how many become impure?
Halacha 5 states: 'If a zav was riding on an animal and there were four surfaces, one under each of the animal's four feet, they are all pure. The rationale is that the animal can stand on three feet. Thus the fourth is not needed.'
Question 5
If a zav was sprawled lengthwise over five benches, what is their status?
Halacha 3 states: 'When a zav was sprawled over five benches that are positioned lengthwise, they are all impure, because each one of them supported the majority of his body.'