A small gadget shop sells three types of gadgets: smartphones, tablets, and smartwatches. Over the past week, the shop recorded the following sales:

• Smartphones: 20
• Tablets: 15
• Smartwatches: 10

If a gadget is selected at random from the total sold, what is the probability that it is a tablet? Express your answer as a fraction in simplest form and as a decimal rounded to two decimal places.