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Number of white balls = 35 Let x be the number of black balls. Total number of balls in the bag = 35 + x Also, the probability of drawing a black ball from the bag is 1.8 times that of drawing a white ball. ⇒ x/(35 + x) = 1.8[35/(35 + x)] ⇒ x = 1.8 × 35 = 63 Hence, the number of black balls in the bag = 63
(75 + 0.25 × 10) × 4 = ?2 - 14
144% of 200 + 11% of 900 + 10% of 20 =?
?% of 500 = 674 - 18% of 800
√2025 + √1024 - √1296 = 20% of ?
300% of (3341 – 471) = ? × (√4225/195)
The sum of two numbers is 16 and their product is 63. The sum of their reciprocal is equal to:
{17 + √2601}/(? + 2) = 17
√ (573 – 819 + 775) = ? ÷ 3