human
Dean has 30 marbles. He gives 1/5  of them to Jamie and gives 10 to Donald. How many marbles are left for Dean?
assistant
How many marbles does Dean give to Jamie? ** Dean gives 30 x 1/5 = <<30*1/5=6>>6 marbles to Jamie.
How many marbles does Dean give in total? ** He gives a total of 6 + 10 = <<6+10=16>>16 marbles in all.
How many marbles does Dean have left? ** So, Dean has 30 - 16 = <<30-16=14>>14 marbles left.
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