A box contains (x + 10) pencils, (x + 15) pens, and (x + 20) markers. The probability of drawing a marker from the box is (2/5). Find the number of pens in the box.
According to question, (x + 20)/[(x + 10) + (x + 15) + (x + 20)] = 2/5 Simplify and solve for x: 5(x+20) = 2(3x + 45) 5x +100 = 6x+ 90 6x -5x = 100-90 x = 10 Therefore, number of orange balls in the bag = 10 + 15 = 25
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