Question

I know the answer, please explain me how to solve.
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Answer 1

Step-by-step explanation:

let number of pens be x

let number of rulers be y

• from the given equation 0.50x+0.15y= 2.50
• $50x + 15y = 250$
• $10x + 3y = 50$
• This equation satisfy when
• x=2 and y=10