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Mary has twice as many pencils as she has pens. Tom borrows a pen. Now, Mary has ten less pens than pencils. How many pencils does Mary does?
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Mary has twice as many pencils as she has pens. Tom borrows a pen. Now, Mary has ten less pens than pencils. How many pencils does Mary does?

User Faber
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Mary has 18 pencils. 18/2 = 9. 9 - 1 = 8. 18 - 10 = 8.
User Rcannood
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