<PRE><B>Question 1141187</B>
let x be the number of pens displayed at the bookstore first
:
3x/5 are red, 2x/5 are blue
:
260 + (2x/5)/4 = x/2
:
260 + (2x/20) = x/2
:
5200 +2x = 20x/2
:
10400 +4x = 20x
:
16x = 10400
:
x = 650
:
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there were 650 pens at first
:
check the answer
:
there are 390 red at first and 260 blue at first
:
260 + (260/4) = (650/2)
:
260 + 65 = 325
:
325 = 325
:
answer checks
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