Question

There are five rooms in my house
hall, kitchen, study room, bedroom
and dining room. There is one light in
each room. Whenever the kitchen light
is on, the study room light is off
Whenever the dining room light is on,
the kitchen light is also on. Whenever
the study room light is on, the hall
light has to be on. How many lights, at
the most, can be on simultaneously?
(a) 5
(b) 4
(c) 3
(d) 2
​

Answer 1

Answer:

4

HoPe iT HeLpS

Step-by-step explanation:

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Answer 2

Answer:

When kitchen light is on, only study room light has to be off. But other lights can be on simultaneously. Whenever study room light is on, the hall light has to be on as well but hall light can be on even if study light is off. Therefore, when study room light is off and kitchen light is on, the lights of hall, dining room and bedroom can be on too. Therefore, the max lights on simultaneously are 4.

Answer is (b) 4