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Answer :
Answer:
350 - 170 – 120 = r
Step-by-step explanation:
Since there is a total of 350 black, blue, and red pens, and we know how many black and blue ones there are, this can be used to find the number of red ones.
350 - 170 – 120 = r can be used to find the number of red pens, because if you subtract the amount of black pens (170) and the amount of blue pens (120) from the total, that will leave you with r, the amount of red pens.
So, 350 - 170 – 120 = r is the correct equation.
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The correct option is 350 - 170 - 120 = r. To find the number of red pens Ms. Karone orders, the equation 350 - 170 - 120 = r should be used, where r represents the number of red pens.
The number of red pens Ms. Karone orders can be found using the equation that accounts for the total number of pens and subtracts the quantities of black and blue pens. The correct equation is:
350 - 170 - 120 = r
This equation sets the total number of pens (350) and subtracts the number of black pens (170) and blue pens (120) Ms. Karone has ordered to solve for r, the number of red pens.
