Plz help: Determine the values of a and b I'm very confused on this question, please give an explanation of how to do the problem

Thank you.​

Acommunity group sells 2,000 tickets for its raffle. the grand prize is a car. neil and 9 of his friends buy 10 tickets each. when the winning ticket number is announced, it is found to belong to neil's group. given this information, what is the probability that the ticket belongs to neil? a.1/5 b.1/10 c.1/200 d.1/4

Divide: 1573 ÷ 7 = a) 222 r5 b) 223 r6 c) 224 r5 d) 224 r3

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?