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?
A step-by-step solution is:
16
Lara gave 15 + 6 = 21 stems of flowers to her grandma.

She gave away 21 + 15 = 36 stems of flowers.

Therefore, Lara put 52 - 36 = 16 stems of flowers in the vase.

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So, the final answer is 16