In a box, 40% of the pens are red. If half of the red pens are removes

Question

In a box, 40% of the pens are red. If half of the red pens are removes, the percentage of red pens in the box will be:

(A) 20% 
(B) 22.5% 
(C) 25% 
(D) 30% 
(E) None of these

rajtare · Answer

Let total pen be 10, so red pens =4, if half of the red pens are removed, then balance red pens will be 2, and balance total pens = 8

thus ratio will be 2/8 = 25%

Lenel · Answer

Let Total pens be x
0.4x is red pens 
0.2x removed (red pens)
0.2x = a% (0.8x)
1/4
25%

C

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FSingh · Answer

I took a testing numbers approach.

Number of pens in the box = 100
40% are red = 40 red pens

Half the red pens are removed = 20 pens

Number of red pens = 20
Total number of pens = 80

Therefore = 20/80 = 0.25

Answer C

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