Volume difference between programmes and commercials

In the UK, if you are watching a channel that broadcasts commercials, you will not only be disappointed with the interruptions but you may also be frustrated with the increase in volume for commercials. So you may either use up the battery on your remote control to either completely switch the sound off or reduce the volume. You have to do the reverse once the programme is back on. Why do the television broadcasters do this? Just stick to the same volume for programmes and commercials.

Phone-in quiz TV

I have briefly watched such a thing and I became curious as to how they arrive at the solution. I am on about the quiz which has only one answer which tend to be numeric. These things seem impossible. I think they have a right to publish not just the answer but also the step-by-step process in arriving at the answer. This should clearly send a message to the people phoning in that they have next to no chance of getting the right answer. I think at the moment, they are debating about publishing the odds of getting the answer. This may not be adequate because how would you accurately calculate the odds?