For this chain-of-thought reasoning and answer, what was the question?
She spent $60 on her younger sister because 4 x 15 = 60. She buys 3 lego sets for her older sister because 60 / 20 = 3.
 A: 3
Q: Tonya is buying Christmas gifts for her sisters. She has 2 sisters and wants to spend the exact same amount on each. She buys her younger sister 4 dolls that cost $15 each. She plans to buy lego sets for her older sister. They cost $20 each. How many lego sets does she buy?