Mr. Llesis kept 50 x 7/10 = <<50*7/10=35>>35 kilograms of rice.
So, he gave 50 - 35 = <<50-35=15>>15 kilograms of rice to Mr. Everest.
Therefore, Mr. Llesis kept 35 - 15 = <<35-15=20>>20 kilograms more than Mr. Everest.
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