Justin and Sabrina at Pine Grove Elementary have 50 pencils combined. Justin has 8 more than twice as many pencils as Sabrina. How many pencils does Sabrina have?
Let's say Sabrina has p number of pencils.
If Justin has 8 more than twice as many pencils as Sabrina, he has 2*p + 8 = 2p+8.
Together, Justin and Sabrina has p +(2p+8)=50.
This is equal to 3p=50-8
3p=42.
The number of pencils that Sabrina has is p=42/3.
Sabrina has p=
<gadget id="calculator">14</gadget>
<output>14</output>
14 pencils.

<result>14</result>