Question

Joe went school supply shopping. He spent $22.50 on notebooks and pencils. Notebooks cost $2.00 and pencils cost $0.50. He brought a total of notebooks and pencils. How many pencils did he buy?

What i did
n+p=15
0.50n+2.00p=22.50

i dont know who to do so on because it doesnt tell you which he had more and etc ex( he had 4 more pencils then notebooks) explain please
2 equations and 2 unknowns, just solve the system by substitution or elimination

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