Question
A box contains 5 blue jellies, some red jelly and rest
yellow jelly. The probability of picking a red ball at random is 3/10, while the probability of picking a yellow jelly at random is 1/5. Find the total number of jellies in the box.Solution
Let the number of red jelly and yellow jelly in the box be x and y respectively. According to the question,jelly {x/(5 + x + y)} = 3/10 Or, 7x -3y = 15...... (1) Also, {y/(5 + x + y)} = 1/5 Or, 4y - x = 5....... (2) On solving equation (1) and (2), we get x = 3 and y = 2 Therefore, total number of jelly = 5 + x + y = 10
More Probability Questions
31% of 3300 +659 = ?
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1365 ÷ 15 + (? ÷ 5) = 62 × 3.5
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?2 = √20.25 × 10 + √16 + 32
36.76 + 2894.713 + 34965.11 =?
(2 ÷ 3) × (4 ÷ 12) × (? ÷ 10) × 45 × (1 ÷ 5) = (? ÷ 6) + (2 ÷ 5)
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