Q2 Lenn's grandmother gives Lenn a vintage pen, and he adds this into his collection of 12 such pens. The he then sells n vintage pens to a museum for $100
While he was cleaning his cupboard, he finds few more vintage pens worth a total of $200
Assume the values of all these vintage pens are same.
Choose all the expressions which indicate the number of vintage pens that Lenn currently has.
12+1-n+non
12 + 1 -1 + 2n
13+
- n + 12 + 1
13-1
13+n
2 + 12 + 1
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