###Human: Peter and his dad Rupert shared the same birthday.  To make it special, they each got their own birthday cake.  Peter has 10 candles on his cake.  Rupert is 3 and 1/2 times older than Peter.  How many candles will be on Rupert's cake?, ### Assistant: Peter is 10 years old because he has 10 birthday candles on his cake.
Rupert is 3.5 times older than Peter so Rupert will have 3.5*10 = 35 candles on his cake. 
 So the answer is :  35