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?
How many candles are on Peter's cake? ** Peter is 10 years old because he has 10 birthday candles on his cake.
How many candles will be on Rupert's cake? ** Rupert is 3.5 times older than Peter so Rupert will have 3.5*10 = <<3.5*10=35>>35 candles on his cake.
#### 35