Lara bought 52 stems of flowers at the flower shop. She gave 15 flowers to her mom and gave 6 more flowers than she gave to her mom to her grandma. She put the rest in a vase. How many stems of flowers did Lara put in the vase?
Lara gave 15 + 6 = <<15+6=21>>21 stems of flowers to her grandma.
She gave away 21 + 15 = <<21+15=36>>36 stems of flowers.
Therefore, Lara put 52 - 36 = <<52-36=16>>16 stems of flowers in the vase.
#### 16