self Maths Puzzle

I have some doubts in the answer of todays puzzle on 18/9/12. you are given there are two positive roots.But p(0) =4 and when you give any values > 0 for x there is no sign change.so intermediate value theorem there will be no roots. also I think that Descartes rule of sign doesn"t assure the roots. please clarify my doubts. I expect your valuable comments

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self Other Question

Girlie gives chocolates to her children. If she give 7 chocolates to each child, she will have 13 chocolates left. If she gives 9 chocolates to each child, she will have 5 chocolates left.
a) Find the number of children.
b) Find the number of chocolates.
465 coins consist of one-rupee, 50-paise and 25 paise coins. Their values are in the ratio 5:3:1. Find the number of each type of coins respectively is