City gates

There are eight places in Budan, some of which are connected by roads. There is a gate at every point where the road leaves or enters the city. No two paths intersect or enter through the same entrance. The number of gates matches one of the numbers 5,15,21,24, or 27. How many roads and city gates are there in Budan?

Final Answer:

a =  3
b =  5

Step-by-step explanation:

a=3
b=5



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