A bag contains 35 white and some black balls. If the probability of drawing a black ball from the bag is 1.8 times that of drawing a white ball, find the number of black balls in the bag.
Given, 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 = 63 Hence, the number of black balls in the bag = 63.
74% of 2840 + 80% of 1640 - ?= 47²
What will come in place of the question mark (?) in the following question?
24.30% of 372.32 = ?
25.6% of 250 + √? = 119
182 – 517 ÷ 11 - √361 = ?
1365 ÷ 15 + (? ÷ 5) = 62 × 3.5
The alarms of two alarm clocks sound at regular intervals of 72 seconds and 80 seconds. If they beep together for the first time at 6:00 am, at what tim...
(168 ÷ 12 + 19 × 64)/(22+1)
33 + (6.25) % of 1600 = ? + 2 X 55
[4(1/3) + 4(1/4)] × 24 – 62 = ?2
