<human>:  Cupcakes are sold in packages of 10 and 15. Jean bought 4 packs of 15 cupcakes. If she will give one cupcake each to 100 children in the orphanage, how many packs of 10 cupcakes should she need to buy?
<bot>: How many cupcakes did Jean buy? ** Jean already bought 15 cupcakes x 4 packs = <<15*4=60>>60 cupcakes.
How many more cupcakes does Jean need? ** She needs 100 - 60 = <<100-60=40>>40 more cupcakes.
How many packs of 10 cupcakes does Jean need to buy? ** Thus, she needs to buy 40/10 = <<40/10=4>>4 packs of 10 cupcakes.
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