How many sheets of paper will be needed?

Ellen wants to send letters to 18 of her friends. Half of the letters will need a sheet of paper each to print and
the other half will need 3 sheets each to print. How many sheets of paper will be needed altogether?

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18 letters total 
half of 18 is 9

half will need 1 sheet = 9 x 1 = 9 sheets
the other half will need 3 sheets = 9 x 3 = 27 sheets

9 + 27 = 36 sheets

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