A bag contains 19 white and some black balls. If the probability of drawing a black ball from the bag is twice that of drawing a white ball, find the number of black balls in the bag.
Given, Number of white balls = 19 Let x be the number of black balls. Total number of balls in the bag = 19 + x Also, the probability of drawing a black ball from the bag is twice that of drawing a white ball. ⇒ x/(19 + x) = 2[19/(19 + x)] ⇒ x = 38 Hence, the number of black balls in the bag = 38.
What should come in the place of question mark (?) in the given expression so that the expression T > Z is definitely true and Y ≥ W is definitely...
Statements: A ≤ E, P < Q > X, E = P, Y ≥ Z = A
Conclusions:
I. Q > E
II. E < X
Statements: A$K; E#N; K@E
Conclusions:
I) A$N
II) A@N
Statements: E > O, S < Z, O ≤ S
Conclusions:
I. E < S
II. O < Z
How many such pairs of letter are there in the word TELEPHONE, each of which has as many letters between them in the word as in the English alphabet?
Which of the following symbols should be placed in the blank spaces (_) respectively (in the same order from left to right) to complete the given expre...
Statements:
C > D ≥ E ≤ F; Y ≥ Z ≥ A = C
Conclusion:
I. Y > F
II. F ≥ Y
In which of these expression ‘X > T’ is definitely True?
Statements: I > E ≥ F; G < D ≤ I; J < E ≤ H
Conclusions:
I. G < E
II. H ≥ F
III. E < D
Statements: T < U = V = W < X < Y; Z = Y < R < S < O
Conclusions:
I. Z > U
II. T < O
