What does this mathematical rebus means ?

Jim has three close friends at his school: Michael, John and Alice. Two of them play football, two play basketball and two play hockey. The friend who does not play hockey does not play basketball as well. The friend who does not play football does not play hockey.

Can you identify which sport/s is played by which person?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

I have branches, but no fruit, trunk or leaves. What am I?

Spot 5 differences in two Christmas tree below:

Can you find the odd number in the following five choices?

1) 482636
2) 259807
3) 865195
4) 104739
5) 391744

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

What Adam and Eve do not have but the rest of the people have?

What goes up but never comes down?