Question
A bag contains 7 blue balls, 3 red balls, and the rest
are black balls. The probability of drawing a black ball from the bag is 4/9. How many black balls are there in the bag?Solution
Let the number of black balls be 'y'. ATQ, y ÷ (y + 7 + 3) = (4/9) Or, 9y = 4 X (y + 10) Or, 9y = 4y + 40 Or, 5y = 40 So, 'y' = 8
564.932 + 849.029 – 425.08 = 612.095 + ?
999.99 + 99.99 + 99= ?
A sum of ₹60,000 is invested at a compound interest rate of 'x%' per annum, compounded annually, and grows to ₹75,264 in 2 ye...
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
³√? × 33.97 + 59.99 × 28.9 – 48.98 × 21.42 = 1085.344
1279.98 ÷ 40.48 × 10.12 = ? × 2.16
(124.901) × (11.93) + 219.95 = ? + 114.891 × 13.90
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
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