<human>:  A 40-bead necklace is made up of three kinds of beads. There are seven amethyst beads and twice as many amber beads as amethysts. The third beads are turquoise. How many turquoise beads are in the necklace?
<bot>: How many amber beads are there? ** There are 7 * 2 = <<7*2=14>>14 amber beads.
How many turquoise beads are there? ** Thus, there are 40 - 7 - 14 = <<40-7-14=19>>19 turquoise beads in the necklace.
#### 19