Ms. Karone orders a total of 350 black, blue, and red pens for the school. • She orders 170 black pens.
• She orders 120 blue pens.
Which equation can be used to find r, the number of red pens Ms. Karone
orders?
350 – 170 + 120 =r
350 + 170 - 120=r
350 – 170 – 120 =r
350 + 170 + 120 = 1
Done
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