Emily has 6 marbles. Megan gives Emily double the number she has. Emily then gives Megan back half of her new total plus 1. How many marbles does Emily have now?
Megan gives Emily 6*2=<<6*2=12>>12 marbles.
Emily then has 6+12=<<6+12=18>>18 marbles.
Emily gives Megan 18/2+1=<<18/2+1=10>>10 marbles.
Emily has 18-10=<<18-10=8>>8 marbles now.
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