Question

Ms.karne oders 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 used to find r the number of red pens Ms.krne orders.
thanks pls help with this

Answer 1

B= black pens

X= blue pens

R= red pens

T=total

B+x+r= t

170+120+r=350

Not sure this is correct but you can solve it like this

Answer 2

Total Number of Pens - (Black Pens + Blue Pens)
350 - (170 + 120)
350 - 290 = 60 pens