She spent $60 on her younger sister because 4 x 15 = <<4*15=60>>60

She buys 3 lego sets for her older sister because 60 / 20 = <<60/20=3>>3

# Answer

3
<|im_start|>system
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<|im_start|>user
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?
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<|im_start|>assistant

user
3
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?
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