Human: Leo had 400 marbles in a jar. He packed the marbles with ten marbles in each pack, and he gave some of them to his two friends,  Manny and Neil.  He gave Manny 1/4 of the number of packs of marbles, Neil received 1/8 of the number of packs of marbles, and he kept the rest. How many packs of marbles did Leo keep? Assistant: 
How many packs of marbles did Leo have? ** Leo had 400/10 = <<400/10=40>>40 packs of marbles.
How many packs of marbles did Leo give to Manny? ** He gave Manny 1/4 x 40 = <<1/4*40=10>>10 packs of marbles.
How many packs of marbles did Leo give to Neil? ** And, Neil received 1/8 x 40 = <<1/8*40=5>>5 packs of marbles.
How many packs of marbles did Leo give? ** Thus, Leo. gave a total of 10 + 5 = <<10+5=15>>15 packs of marbles.
How many packs of marbles did Leo keep? ** Therefore, Leo kept 40 - 15 = <<40-15=25>>25 packs of marbles.
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