Question
A container holds (x + 10) marble stones, (x + 12)
quartz stones, and (x + 20) granite stones. The probability of drawing a granite stone is (5/12). Find the number of quartz stones in the container.Solution
According to question, (x + 20)/[(x + 10) + (x + 12) + (x + 20)] = 5/12 Simplify and solve for x: 12(x+20) = 5(3x + 42) 12x +240 = 15x+ 210 15x -12x = 240-210 3x = 30 x= 10 Therefore, number of orange balls in the bag = 10 + 12 = 22
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What value should come in place of the question mark (?) in the following question?
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121/? = ?/144 6% of 520 + 5% of 620 = ?
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