<human>:  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?
<bot>: How much did she spend on her younger sister? ** She spent $60 on her younger sister because 4 x 15 = <<4*15=60>>60
How many lego sets does she buy? ** She buys 3 lego sets for her older sister because 60 / 20 = <<60/20=3>>3
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