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tia_tia [17]
3 years ago
7

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 do

es Mary does?
Mathematics
1 answer:
I am Lyosha [343]3 years ago
3 0
X - the number of pencils
y - the number of pens

She has twice as many pencils as she has pens.
x=2y

Tom borrows a pen, so she has y-1 pens. Now she has ten less pens than pencils.
x-10=y-1 \\
x=y-1+10 \\
x=y+9

Set 2y and y+9 equal to each other:
2y=y+9 \\
2y-y=9 \\
y=9
She has 9 pens.
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