Danny brings 3 watermelons to his family picnic. He cuts each watermelon into 10 slices. His sister brings 1 watermelon to the family picnic, and she cuts the watermelon into 15 slices. How many watermelon slices are there in total at the picnic?
How many watermelon slices does Danny bring? ** From Danny, there are 3 * 10 = <<3*10=30>>30 watermelon slices
How many watermelon slices does his sister bring? ** From his sister, there are 1 * 15 = <<1*15=15>>15 watermelon slices
How many watermelon slices are there in total at the picnic? ** There are a total of 30 + 15 = <<30+15=45>>45 watermelon slices
#### 45